| 1 |  |  | <?php | 
            
                                                                                                            
                            
            
                                    
            
            
                | 2 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 3 |  |  | namespace IbanGenerator; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 4 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 5 |  |  | use IbanGenerator\Bban\BbanInterface; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 6 |  |  | use IbanGenerator\Bban\SpainBban; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 7 |  |  | use InvalidArgumentException; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 8 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 9 |  |  | class Iban | 
            
                                                                                                            
                            
            
                                    
            
            
                | 10 |  |  | { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 11 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 12 |  |  |      * @var BbanInterface | 
            
                                                                                                            
                            
            
                                    
            
            
                | 13 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 14 |  |  |     private $bban; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 15 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 16 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 17 |  |  |      * @var string | 
            
                                                                                                            
                            
            
                                    
            
            
                | 18 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 19 |  |  |     private $countryCode; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 20 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 21 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 22 |  |  |      * @var string | 
            
                                                                                                            
                            
            
                                    
            
            
                | 23 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 24 |  |  |     private $checkDigits; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 25 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 26 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 27 |  |  |      * @var array | 
            
                                                                                                            
                            
            
                                    
            
            
                | 28 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 29 |  |  |     private static $countriesSupported = [ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 30 |  |  |         'ES' => SpainBban::class, | 
            
                                                                                                            
                            
            
                                    
            
            
                | 31 |  |  |     ]; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 32 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 33 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 34 |  |  |      * Iban constructor. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 35 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 36 |  |  |      * @param string $countryCode | 
            
                                                                                                            
                            
            
                                    
            
            
                | 37 |  |  |      * @param string $checkDigits | 
            
                                                                                                            
                            
            
                                    
            
            
                | 38 |  |  |      * @param BbanInterface $bban | 
            
                                                                                                            
                            
            
                                    
            
            
                | 39 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 40 |  |  |      * @throws InvalidArgumentException | 
            
                                                                                                            
                            
            
                                    
            
            
                | 41 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 42 |  |  |     public function __construct($countryCode, $checkDigits, BbanInterface $bban) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 43 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 44 |  |  |         $countryCode = strtoupper($countryCode); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 45 |  |  |         static::validateCountryCodeFormat($countryCode); | 
                            
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                | 46 |  |  |         static::validateCheckDigitsFormat($checkDigits); | 
                            
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                | 47 |  |  |         static::validateControlDigit($countryCode, $checkDigits, $bban); | 
                            
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                | 48 |  |  |         $this->countryCode = $countryCode; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 49 |  |  |         $this->checkDigits = $checkDigits; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 50 |  |  |         $this->bban = $bban; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 51 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 52 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 53 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 54 |  |  |      * @param string $iban | 
            
                                                                                                            
                            
            
                                    
            
            
                | 55 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 56 |  |  |      * @throws InvalidArgumentException | 
            
                                                                                                            
                            
            
                                    
            
            
                | 57 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 58 |  |  |      * @return static | 
            
                                                                                                            
                            
            
                                    
            
            
                | 59 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 60 |  |  |     public static function fromString($iban) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 61 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 62 |  |  |         if (! preg_match('/^[0-9A-Z]{16,34}$/', $iban)) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 63 |  |  |             throw new InvalidArgumentException('Iban should be between 16 and 34 characters'); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 64 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 65 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 66 |  |  |         $countryCode = substr($iban, 0, 2); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 67 |  |  |         $checkDigits = substr($iban, 2, 2); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 68 |  |  |         $bbanString = substr($iban, 4); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 69 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 70 |  |  |         self::validateSupportedCountry($countryCode); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 71 |  |  |         $bbanClass = self::$countriesSupported[$countryCode]; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 72 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 73 |  |  |         /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 74 |  |  |          * @var BbanInterface | 
            
                                                                                                            
                            
            
                                    
            
            
                | 75 |  |  |          */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 76 |  |  |         $bban = $bbanClass::fromString($bbanString); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 77 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 78 |  |  |         return new static($countryCode, $checkDigits, $bban); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 79 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 80 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 81 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 82 |  |  |      * @param BbanInterface $bban | 
            
                                                                                                            
                            
            
                                    
            
            
                | 83 |  |  |      * @param string $countryCode | 
            
                                                                                                            
                            
            
                                    
            
            
                | 84 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 85 |  |  |      * @throws InvalidArgumentException | 
            
                                                                                                            
                            
            
                                    
            
            
                | 86 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 87 |  |  |      * @return static | 
            
                                                                                                            
                            
            
                                    
            
            
                | 88 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 89 |  |  |     public static function fromBbanAndCountry(BbanInterface $bban, $countryCode) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 90 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 91 |  |  |         static::validateCountryCodeFormat($countryCode); | 
                            
                    |  |  |  | 
                                                                                        
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                | 92 |  |  |         static::validateCountryCodeFormat($countryCode); | 
                            
                    |  |  |  | 
                                                                                        
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                | 93 |  |  |         static::validateSupportedCountry($countryCode); | 
                            
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                | 94 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 95 |  |  |         $checksum = self::validateChecksum($countryCode, '00', $bban); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 96 |  |  |         $checkDigit = 98 - (int) $checksum; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 97 |  |  |         $checkDigit = str_pad($checkDigit, 2, 0, STR_PAD_LEFT); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 98 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 99 |  |  |         return new static($countryCode, $checkDigit, $bban); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 100 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 101 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 102 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 103 |  |  |      * @return string | 
            
                                                                                                            
                            
            
                                    
            
            
                | 104 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 105 |  |  |     public function countryCode() | 
            
                                                                                                            
                            
            
                                    
            
            
                | 106 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 107 |  |  |         return $this->countryCode; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 108 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 109 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 110 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 111 |  |  |      * @return string | 
            
                                                                                                            
                            
            
                                    
            
            
                | 112 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 113 |  |  |     public function ibanCheckDigits() | 
            
                                                                                                            
                            
            
                                    
            
            
                | 114 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 115 |  |  |         return $this->checkDigits; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 116 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 117 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 118 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 119 |  |  |      * @return string | 
            
                                                                                                            
                            
            
                                    
            
            
                | 120 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 121 |  |  |     public function bankCode() | 
            
                                                                                                            
                            
            
                                    
            
            
                | 122 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 123 |  |  |         return $this->bban->bankCode(); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 124 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 125 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 126 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 127 |  |  |      * @return string | 
            
                                                                                                            
                            
            
                                    
            
            
                | 128 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 129 |  |  |     public function branchCode() | 
            
                                                                                                            
                            
            
                                    
            
            
                | 130 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 131 |  |  |         return $this->bban->branchCode(); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 132 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 133 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 134 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 135 |  |  |      * @return string | 
            
                                                                                                            
                            
            
                                    
            
            
                | 136 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 137 |  |  |     public function countryCheckDigits() | 
            
                                                                                                            
                            
            
                                    
            
            
                | 138 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 139 |  |  |         return $this->bban->checkDigits(); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 140 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 141 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 142 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 143 |  |  |      * @return string | 
            
                                                                                                            
                            
            
                                    
            
            
                | 144 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 145 |  |  |     public function accountNumber() | 
            
                                                                                                            
                            
            
                                    
            
            
                | 146 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 147 |  |  |         return $this->bban->accountNumber(); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 148 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 149 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 150 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 151 |  |  |      * @return string | 
            
                                                                                                            
                            
            
                                    
            
            
                | 152 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 153 |  |  |     public function __toString() | 
            
                                                                                                            
                            
            
                                    
            
            
                | 154 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 155 |  |  |         $bbanString = $this->bban; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 156 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 157 |  |  |         return $this->countryCode . $this->checkDigits . $bbanString; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 158 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 159 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 160 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 161 |  |  |      * @param $countryCode | 
            
                                                                                                            
                            
            
                                    
            
            
                | 162 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 163 |  |  |      * @throws InvalidArgumentException | 
            
                                                                                                            
                            
            
                                    
            
            
                | 164 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 165 |  |  |     private static function validateCountryCodeFormat($countryCode) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 166 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 167 |  |  |         if (! preg_match('/^[A-Z]{2}$/', $countryCode)) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 168 |  |  |             throw new InvalidArgumentException('The country code should be 2 letters'); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 169 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 170 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 171 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 172 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 173 |  |  |      * @param $checkDigits | 
            
                                                                                                            
                            
            
                                    
            
            
                | 174 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 175 |  |  |      * @throws InvalidArgumentException | 
            
                                                                                                            
                            
            
                                    
            
            
                | 176 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 177 |  |  |     private static function validateCheckDigitsFormat($checkDigits) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 178 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 179 |  |  |         if (! preg_match('/^[\d]{2}$/', $checkDigits)) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 180 |  |  |             throw new InvalidArgumentException('The IBAN checksum must be 2 numeric characters'); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 181 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 182 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 183 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 184 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 185 |  |  |      * @param string $countryCode | 
            
                                                                                                            
                            
            
                                    
            
            
                | 186 |  |  |      * @param string $checkDigits | 
            
                                                                                                            
                            
            
                                    
            
            
                | 187 |  |  |      * @param BbanInterface $bban | 
            
                                                                                                            
                            
            
                                    
            
            
                | 188 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 189 |  |  |      * @throws InvalidArgumentException | 
            
                                                                                                            
                            
            
                                    
            
            
                | 190 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 191 |  |  |     private static function validateControlDigit( | 
            
                                                                                                            
                            
            
                                    
            
            
                | 192 |  |  |         $countryCode, | 
            
                                                                                                            
                            
            
                                    
            
            
                | 193 |  |  |         $checkDigits, | 
            
                                                                                                            
                            
            
                                    
            
            
                | 194 |  |  |         BbanInterface $bban | 
            
                                                                                                            
                            
            
                                    
            
            
                | 195 |  |  |     ) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 196 |  |  |         $checksum = self::validateChecksum($countryCode, $checkDigits, $bban); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 197 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 198 |  |  |         if ($checksum !== '01') { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 199 |  |  |             throw new InvalidArgumentException('The IBAN checksum digits are not valid'); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 200 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 201 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 202 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 203 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 204 |  |  |      * @param $countryCode | 
            
                                                                                                            
                            
            
                                    
            
            
                | 205 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 206 |  |  |      * @throws InvalidArgumentException | 
            
                                                                                                            
                            
            
                                    
            
            
                | 207 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 208 |  |  |     private static function validateSupportedCountry($countryCode) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 209 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 210 |  |  |         if (!array_key_exists($countryCode, self::$countriesSupported)) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 211 |  |  |             throw new InvalidArgumentException( | 
            
                                                                                                            
                            
            
                                    
            
            
                | 212 |  |  |                 sprintf( | 
            
                                                                                                            
                            
            
                                    
            
            
                | 213 |  |  |                     'The country code %s is not supported', | 
            
                                                                                                            
                            
            
                                    
            
            
                | 214 |  |  |                     $countryCode | 
            
                                                                                                            
                            
            
                                    
            
            
                | 215 |  |  |                 ) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 216 |  |  |             ); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 217 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 218 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 219 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 220 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 221 |  |  |      * @param $countryCode | 
            
                                                                                                            
                            
            
                                    
            
            
                | 222 |  |  |      * @param $checkDigits | 
            
                                                                                                            
                            
            
                                    
            
            
                | 223 |  |  |      * @param BbanInterface $bban | 
            
                                                                                                            
                            
            
                                    
            
            
                | 224 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 225 |  |  |      * @return string | 
            
                                                                                                            
                            
            
                                    
            
            
                | 226 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 227 |  |  |     private static function validateChecksum($countryCode, $checkDigits, BbanInterface $bban) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 228 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 229 |  |  |         $rearranged = (string) $bban . $countryCode . $checkDigits; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 230 |  |  |         $digitsList = str_split($rearranged); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 231 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 232 |  |  |         $digitsList = array_map(['self', 'digitToInt'], $digitsList); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 233 |  |  |         $stringToCompute = implode('', $digitsList); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 234 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 235 |  |  |         $checksum = bcmod($stringToCompute, '97'); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 236 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 237 |  |  |         return str_pad($checksum, 2, 0, STR_PAD_LEFT); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 238 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 239 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 240 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 241 |  |  |      * @param string $value | 
            
                                                                                                            
                            
            
                                    
            
            
                | 242 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 243 |  |  |      * @return int | 
            
                                                                                                            
                                                                
            
                                    
            
            
                | 244 |  |  |      */ | 
            
                                                        
            
                                    
            
            
                | 245 |  |  |     private static function digitToInt($value) | 
                            
                    |  |  |  | 
                                                                                        
                                                                                     | 
            
                                                        
            
                                    
            
            
                | 246 |  |  |     { | 
            
                                                        
            
                                    
            
            
                | 247 |  |  |         if (is_numeric($value)) { | 
            
                                                        
            
                                    
            
            
                | 248 |  |  |             return (int) $value; | 
            
                                                        
            
                                    
            
            
                | 249 |  |  |         } | 
            
                                                        
            
                                    
            
            
                | 250 |  |  |  | 
            
                                                        
            
                                    
            
            
                | 251 |  |  |         return ord($value) - 55; | 
            
                                                        
            
                                    
            
            
                | 252 |  |  |     } | 
            
                                                        
            
                                    
            
            
                | 253 |  |  | } | 
            
                                                        
            
                                    
            
            
                | 254 |  |  |  | 
            
                        
Let’s assume you have a class which uses late-static binding:
}
The code above will run fine in your PHP runtime. However, if you now create a sub-class and call the
getSomeVariable()on that sub-class, you will receive a runtime error:In the case above, it makes sense to update
SomeClassto useselfinstead: