| 1 |  |  | <?php | 
            
                                                                                                            
                            
            
                                    
            
            
                | 2 |  |  | /* | 
            
                                                                                                            
                            
            
                                    
            
            
                | 3 |  |  | * File: ImapProtocol.php | 
            
                                                                                                            
                            
            
                                    
            
            
                | 4 |  |  | * Category: Protocol | 
            
                                                                                                            
                            
            
                                    
            
            
                | 5 |  |  | * Author: M.Goldenbaum | 
            
                                                                                                            
                            
            
                                    
            
            
                | 6 |  |  | * Created: 16.09.20 18:27 | 
            
                                                                                                            
                            
            
                                    
            
            
                | 7 |  |  | * Updated: - | 
            
                                                                                                            
                            
            
                                    
            
            
                | 8 |  |  | * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 9 |  |  | * Description: | 
            
                                                                                                            
                            
            
                                    
            
            
                | 10 |  |  | *  - | 
            
                                                                                                            
                            
            
                                    
            
            
                | 11 |  |  | */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 12 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 13 |  |  | namespace Webklex\PHPIMAP\Connection\Protocols; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 14 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 15 |  |  | use Webklex\PHPIMAP\Exceptions\ConnectionFailedException; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 16 |  |  | use Webklex\PHPIMAP\IMAP; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 17 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 18 |  |  | /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 19 |  |  |  * Class Protocol | 
            
                                                                                                            
                            
            
                                    
            
            
                | 20 |  |  |  * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 21 |  |  |  * @package Webklex\PHPIMAP\Connection\Protocols | 
            
                                                                                                            
                            
            
                                    
            
            
                | 22 |  |  |  */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 23 |  |  | abstract class Protocol implements ProtocolInterface { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 24 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 25 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 26 |  |  |      * Default connection timeout in seconds | 
            
                                                                                                            
                            
            
                                    
            
            
                | 27 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 28 |  |  |     protected $connection_timeout = 30; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 29 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 30 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 31 |  |  |      * @var boolean | 
            
                                                                                                            
                            
            
                                    
            
            
                | 32 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 33 |  |  |     protected $debug = false; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 34 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 35 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 36 |  |  |      * @var false|resource | 
            
                                                                                                            
                            
            
                                    
            
            
                | 37 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 38 |  |  |     public $stream = false; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 39 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 40 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 41 |  |  |      * Connection encryption method | 
            
                                                                                                            
                            
            
                                    
            
            
                | 42 |  |  |      * @var mixed $encryption | 
            
                                                                                                            
                            
            
                                    
            
            
                | 43 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 44 |  |  |     protected $encryption = false; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 45 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 46 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 47 |  |  |      * Set to false to ignore SSL certificate validation | 
            
                                                                                                            
                            
            
                                    
            
            
                | 48 |  |  |      * @var bool | 
            
                                                                                                            
                            
            
                                    
            
            
                | 49 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 50 |  |  |     protected $cert_validation = true; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 51 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 52 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 53 |  |  |      * Proxy settings | 
            
                                                                                                            
                            
            
                                    
            
            
                | 54 |  |  |      * @var array | 
            
                                                                                                            
                            
            
                                    
            
            
                | 55 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 56 |  |  |     protected $proxy = [ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 57 |  |  |         'socket' => null, | 
            
                                                                                                            
                            
            
                                    
            
            
                | 58 |  |  |         'request_fulluri' => false, | 
            
                                                                                                            
                            
            
                                    
            
            
                | 59 |  |  |         'username' => null, | 
            
                                                                                                            
                            
            
                                    
            
            
                | 60 |  |  |         'password' => null, | 
            
                                                                                                            
                            
            
                                    
            
            
                | 61 |  |  |     ]; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 62 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 63 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 64 |  |  |      * Get an available cryptographic method | 
            
                                                                                                            
                            
            
                                    
            
            
                | 65 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 66 |  |  |      * @return int | 
            
                                                                                                            
                            
            
                                    
            
            
                | 67 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 68 |  |  |     public function getCryptoMethod() { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 69 |  |  |         // Allow the best TLS version(s) we can | 
            
                                                                                                            
                            
            
                                    
            
            
                | 70 |  |  |         $cryptoMethod = STREAM_CRYPTO_METHOD_TLS_CLIENT; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 71 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 72 |  |  |         // PHP 5.6.7 dropped inclusion of TLS 1.1 and 1.2 in STREAM_CRYPTO_METHOD_TLS_CLIENT | 
            
                                                                                                            
                            
            
                                    
            
            
                | 73 |  |  |         // so add them back in manually if we can | 
            
                                                                                                            
                            
            
                                    
            
            
                | 74 |  |  |         if (defined('STREAM_CRYPTO_METHOD_TLSv1_2_CLIENT')) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 75 |  |  |             $cryptoMethod = STREAM_CRYPTO_METHOD_TLSv1_2_CLIENT; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 76 |  |  |         }elseif (defined('STREAM_CRYPTO_METHOD_TLSv1_1_CLIENT')) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 77 |  |  |             $cryptoMethod = STREAM_CRYPTO_METHOD_TLSv1_1_CLIENT; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 78 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 79 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 80 |  |  |         return $cryptoMethod; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 81 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 82 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 83 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 84 |  |  |      * Enable SSL certificate validation | 
            
                                                                                                            
                            
            
                                    
            
            
                | 85 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 86 |  |  |      * @return $this | 
            
                                                                                                            
                            
            
                                    
            
            
                | 87 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 88 |  |  |     public function enableCertValidation() { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 89 |  |  |         $this->cert_validation = true; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 90 |  |  |         return $this; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 91 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 92 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 93 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 94 |  |  |      * Disable SSL certificate validation | 
            
                                                                                                            
                            
            
                                    
            
            
                | 95 |  |  |      * @return $this | 
            
                                                                                                            
                            
            
                                    
            
            
                | 96 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 97 |  |  |     public function disableCertValidation() { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 98 |  |  |         $this->cert_validation = false; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 99 |  |  |         return $this; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 100 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 101 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 102 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 103 |  |  |      * Set SSL certificate validation | 
            
                                                                                                            
                            
            
                                    
            
            
                | 104 |  |  |      * @var int $cert_validation | 
            
                                                                                                            
                            
            
                                    
            
            
                | 105 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 106 |  |  |      * @return $this | 
            
                                                                                                            
                            
            
                                    
            
            
                | 107 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 108 |  |  |     public function setCertValidation($cert_validation) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 109 |  |  |         $this->cert_validation = $cert_validation; | 
                            
                    |  |  |  | 
                                                                                        
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                | 110 |  |  |         return $this; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 111 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 112 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 113 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 114 |  |  |      * Should we validate SSL certificate? | 
            
                                                                                                            
                            
            
                                    
            
            
                | 115 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 116 |  |  |      * @return bool | 
            
                                                                                                            
                            
            
                                    
            
            
                | 117 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 118 |  |  |     public function getCertValidation() { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 119 |  |  |         return $this->cert_validation; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 120 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 121 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 122 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 123 |  |  |      * Set connection proxy settings | 
            
                                                                                                            
                            
            
                                    
            
            
                | 124 |  |  |      * @var array $options | 
            
                                                                                                            
                            
            
                                    
            
            
                | 125 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 126 |  |  |      * @return $this | 
            
                                                                                                            
                            
            
                                    
            
            
                | 127 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 128 |  |  |     public function setProxy($options) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 129 |  |  |         foreach ($this->proxy as $key => $val) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 130 |  |  |             if (isset($options[$key])) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 131 |  |  |                 $this->proxy[$key] = $options[$key]; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 132 |  |  |             } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 133 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 134 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 135 |  |  |         return $this; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 136 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 137 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 138 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 139 |  |  |      * Get the current proxy settings | 
            
                                                                                                            
                            
            
                                    
            
            
                | 140 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 141 |  |  |      * @return array | 
            
                                                                                                            
                            
            
                                    
            
            
                | 142 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 143 |  |  |     public function getProxy() { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 144 |  |  |         return $this->proxy; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 145 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 146 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 147 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 148 |  |  |      * Prepare socket options | 
            
                                                                                                            
                            
            
                                    
            
            
                | 149 |  |  |      * @var string $transport | 
            
                                                                                                            
                            
            
                                    
            
            
                | 150 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 151 |  |  |      * @return array | 
            
                                                                                                            
                            
            
                                    
            
            
                | 152 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 153 |  |  |     private function defaultSocketOptions($transport) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 154 |  |  |         $options = []; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 155 |  |  |         if ($this->encryption != false) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 156 |  |  |             $options["ssl"] = [ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 157 |  |  |                 'verify_peer_name' => $this->getCertValidation(), | 
            
                                                                                                            
                            
            
                                    
            
            
                | 158 |  |  |                 'verify_peer'      => $this->getCertValidation(), | 
            
                                                                                                            
                            
            
                                    
            
            
                | 159 |  |  |             ]; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 160 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 161 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 162 |  |  |         if ($this->proxy["socket"] != null) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 163 |  |  |             $options[$transport]["proxy"] = $this->proxy["socket"]; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 164 |  |  |             $options[$transport]["request_fulluri"] = $this->proxy["request_fulluri"]; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 165 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 166 |  |  |             if ($this->proxy["username"] != null) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 167 |  |  |                 $auth = base64_encode($this->proxy["username"].':'.$this->proxy["password"]); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 168 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 169 |  |  |                 $options[$transport]["header"] = [ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 170 |  |  |                     "Proxy-Authorization: Basic $auth" | 
            
                                                                                                            
                            
            
                                    
            
            
                | 171 |  |  |                 ]; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 172 |  |  |             } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 173 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 174 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 175 |  |  |         return $options; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 176 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 177 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 178 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 179 |  |  |      * Create a new resource stream | 
            
                                                                                                            
                            
            
                                    
            
            
                | 180 |  |  |      * @param $transport | 
            
                                                                                                            
                            
            
                                    
            
            
                | 181 |  |  |      * @param string $host hostname or IP address of IMAP server | 
            
                                                                                                            
                            
            
                                    
            
            
                | 182 |  |  |      * @param int $port of IMAP server, default is 143 (993 for ssl) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 183 |  |  |      * @param int $timeout timeout in seconds for initiating session | 
            
                                                                                                            
                            
            
                                    
            
            
                | 184 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 185 |  |  |      * @return resource|boolean The socket created. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 186 |  |  |      * @throws ConnectionFailedException | 
            
                                                                                                            
                            
            
                                    
            
            
                | 187 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 188 |  |  |     protected function createStream($transport, $host, $port, $timeout) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 189 |  |  |         $socket = "$transport://$host:$port"; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 190 |  |  |         $stream = stream_socket_client($socket, $errno, $errstr, $timeout, | 
            
                                                                                                            
                            
            
                                    
            
            
                | 191 |  |  |             STREAM_CLIENT_CONNECT, | 
            
                                                                                                            
                            
            
                                    
            
            
                | 192 |  |  |             stream_context_create($this->defaultSocketOptions($transport)) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 193 |  |  |         ); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 194 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 195 |  |  |         if (!$stream) { | 
                            
                    |  |  |  | 
                                                                                        
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                | 196 |  |  |             throw new ConnectionFailedException($errstr, $errno); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 197 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 198 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 199 |  |  |         if (false === stream_set_timeout($stream, $timeout)) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 200 |  |  |             throw new ConnectionFailedException('Failed to set stream timeout'); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 201 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 202 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 203 |  |  |         return $stream; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 204 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 205 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 206 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 207 |  |  |      * @return int | 
            
                                                                                                            
                            
            
                                    
            
            
                | 208 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 209 |  |  |     public function getConnectionTimeout() { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 210 |  |  |         return $this->connection_timeout; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 211 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 212 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 213 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 214 |  |  |      * @param int $connection_timeout | 
            
                                                                                                            
                            
            
                                    
            
            
                | 215 |  |  |      * @return Protocol | 
            
                                                                                                            
                            
            
                                    
            
            
                | 216 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 217 |  |  |     public function setConnectionTimeout($connection_timeout) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 218 |  |  |         if ($connection_timeout !== null) { | 
                            
                    |  |  |  | 
                                                                                        
                                                                                     | 
            
                                                                                                            
                            
            
                                    
            
            
                | 219 |  |  |             $this->connection_timeout = $connection_timeout; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 220 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 221 |  |  |         return $this; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 222 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 223 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 224 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 225 |  |  |      * Get the UID key string | 
            
                                                                                                            
                            
            
                                    
            
            
                | 226 |  |  |      * @param int|string $uid | 
            
                                                                                                            
                            
            
                                    
            
            
                | 227 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 228 |  |  |      * @return string | 
            
                                                                                                            
                                                                
            
                                    
            
            
                | 229 |  |  |      */ | 
            
                                                                        
                            
            
                                    
            
            
                | 230 |  |  |     public function getUIDKey($uid) { | 
            
                                                                        
                            
            
                                    
            
            
                | 231 |  |  |         if ($uid == IMAP::ST_UID || $uid == IMAP::FT_UID) { | 
            
                                                                        
                            
            
                                    
            
            
                | 232 |  |  |             return "UID"; | 
            
                                                                        
                            
            
                                    
            
            
                | 233 |  |  |         } | 
            
                                                                        
                            
            
                                    
            
            
                | 234 |  |  |         if (strlen($uid) > 0 && !is_numeric($uid)) { | 
            
                                                                        
                            
            
                                    
            
            
                | 235 |  |  |             return (string)$uid; | 
            
                                                                        
                            
            
                                    
            
            
                | 236 |  |  |         } | 
            
                                                                        
                            
            
                                    
            
            
                | 237 |  |  |  | 
            
                                                                        
                            
            
                                    
            
            
                | 238 |  |  |         return ""; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 239 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 240 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 241 |  |  |     public function buildUIDCommand($command, $uid) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 242 |  |  |         return trim($this->getUIDKey($uid)." ".$command); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 243 |  |  |     } | 
            
                                                                                                            
                                                                
            
                                    
            
            
                | 244 |  |  |  | 
            
                                                        
            
                                    
            
            
                | 245 |  |  | } | 
            
                        
This check looks for assignments to scalar types that may be of the wrong type.
To ensure the code behaves as expected, it may be a good idea to add an explicit type cast.