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<?php |
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namespace WebComplete\core\utils\helpers; |
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class StringHelper |
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{ |
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/** |
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* Encodes string into "Base 64 Encoding with URL and Filename Safe Alphabet" (RFC 4648) |
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* |
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* > Note: Base 64 padding `=` may be at the end of the returned string. |
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* > `=` is not transparent to URL encoding. |
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* |
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* @see https://tools.ietf.org/html/rfc4648#page-7 |
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* @param string $input the string to encode. |
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* @return string encoded string. |
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*/ |
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public function base64UrlEncode($input): string |
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{ |
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return \strtr(\base64_encode($input), '+/', '-_'); |
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} |
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/** |
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* Decodes "Base 64 Encoding with URL and Filename Safe Alphabet" (RFC 4648) |
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* |
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* @see https://tools.ietf.org/html/rfc4648#page-7 |
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* @param string $input encoded string. |
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* @return string decoded string. |
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*/ |
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public function base64UrlDecode($input): string |
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{ |
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return \base64_decode(\strtr($input, '-_', '+/')); |
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} |
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/** |
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* Returns the number of bytes in the given string. |
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* This method ensures the string is treated as a byte array by using `mb_strlen()`. |
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* @param string $string the string being measured for length |
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* @return int the number of bytes in the given string. |
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*/ |
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public function byteLength($string) |
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{ |
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return \mb_strlen($string, '8bit'); |
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} |
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/** |
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* Returns the portion of string specified by the start and length parameters. |
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* This method ensures the string is treated as a byte array by using `mb_substr()`. |
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* @param string $string the input string. Must be one character or longer. |
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* @param int $start the starting position |
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* @param int $length the desired portion length. If not specified or `null`, there will be |
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* no limit on length i.e. the output will be until the end of the string. |
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* @return string the extracted part of string, or FALSE on failure or an empty string. |
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* @see http://www.php.net/manual/en/function.substr.php |
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*/ |
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public function byteSubstr($string, $start, $length = null) |
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{ |
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return \mb_substr($string, $start, $length === null ? \mb_strlen($string, '8bit') : $length, '8bit'); |
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} |
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} |
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web-complete /
core
