Created
November 26, 2010 01:56
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Search and replace in PHP serialized data.
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| <?php | |
| /** | |
| * @file Search and replace in PHP serialized data. | |
| * @license http://opensource.org/licenses/lgpl-3.0.html The GNU Lesser General Public License, version 3.0 (LGPLv3) | |
| * @author Raphael Huefner http://www.raphaelhuefner.com | |
| * Sponsored by Affinity Bridge http://www.affinitybridge.com | |
| */ | |
| class SearchAndReplaceSerialized { | |
| protected $_input = ''; | |
| protected $_search = ''; | |
| protected $_replace = ''; | |
| public function __construct($input='', $search='', $replace='') { | |
| $this->_input = $input; | |
| $this->_search = $search; | |
| $this->_replace = $replace; | |
| } | |
| public function run() { | |
| return $this->_eat(); | |
| } | |
| protected function _eatRegEx($regEx) { | |
| $matches = array(); | |
| if (0 == preg_match('/^' . $regEx . '/', $this->_input, $matches)) { | |
| throw new Exception('Did not find something matching the expected pattern /^' . $regEx . '/ --> found this instead: ' . $this->_input); | |
| } | |
| $found = $matches[0]; | |
| $found_len = strlen($found); | |
| $this->_input = substr($this->_input, $found_len); | |
| return $found; | |
| } | |
| protected function _eatType() { | |
| return $this->_eatRegEx('[bidsarRON]'); | |
| } | |
| protected function _eatColon() { | |
| return $this->_eatRegEx(':'); | |
| } | |
| protected function _eatSemicolon() { | |
| return $this->_eatRegEx(';'); | |
| } | |
| protected function _eatQuote() { | |
| return $this->_eatRegEx('"'); | |
| } | |
| protected function _eatBraceOpen() { | |
| return $this->_eatRegEx('\{'); | |
| } | |
| protected function _eatBraceClose() { | |
| return $this->_eatRegEx('\}'); | |
| } | |
| protected function _eatInt() { | |
| return $this->_eatRegEx('-?\d+'); | |
| } | |
| protected function _eatFloat() { | |
| return $this->_eatRegEx('[-+]?[0-9]*\.?[0-9]+([eE][-+]?[0-9]+)?'); | |
| } | |
| protected function _eatBool() { | |
| return $this->_eatRegEx('[01]'); | |
| } | |
| protected function _eatString($len) { | |
| $found = substr($this->_input, 0, $len); | |
| $this->_input = substr($this->_input, $len); | |
| return $found; | |
| } | |
| protected function _eat() { | |
| $type = $this->_eatType(); | |
| switch ($type) { | |
| case 'b': | |
| $this->_eatColon(); | |
| $bool = $this->_eatBool(); | |
| $this->_eatSemicolon(); | |
| return 'b:' . $bool . ';'; | |
| case 'i': | |
| $this->_eatColon(); | |
| $int = $this->_eatInt(); | |
| $this->_eatSemicolon(); | |
| return 'i:' . $int . ';'; | |
| case 'd': | |
| $this->_eatColon(); | |
| $float = $this->_eatFloat(); | |
| $this->_eatSemicolon(); | |
| return 'd:' . $float . ';'; | |
| case 's': | |
| $this->_eatColon(); | |
| $len = $this->_eatInt(); | |
| $this->_eatColon(); | |
| $this->_eatQuote(); | |
| $str = $this->_eatString($len); | |
| $this->_eatQuote(); | |
| $this->_eatSemicolon(); | |
| $new_str = str_replace($this->_search, $this->_replace, $str); | |
| $new_len = strlen($new_str); | |
| return 's:' . $new_len . ':"' . $new_str . '";'; | |
| case 'a': | |
| $this->_eatColon(); | |
| $len = $this->_eatInt(); | |
| $this->_eatColon(); | |
| $this->_eatBraceOpen(); | |
| $subThings = ''; | |
| for ($i = 0; $i < ($len*2); $i++) { | |
| $subThings .= $this->_eat(); | |
| } | |
| $this->_eatBraceClose(); | |
| return 'a:' . $len . ':{' . $subThings . '}'; | |
| case 'r': | |
| $this->_eatColon(); | |
| $recursionId = $this->_eatInt(); | |
| $this->_eatSemicolon(); | |
| return 'r:' . $recursionId . ';'; | |
| case 'R': // same as "r", but we better keep the capitalization, just in case... :-) | |
| $this->_eatColon(); | |
| $recursionId = $this->_eatInt(); | |
| $this->_eatSemicolon(); | |
| return 'R:' . $recursionId . ';'; | |
| case 'O': | |
| $this->_eatColon(); | |
| $classNameLen = $this->_eatInt(); | |
| $this->_eatColon(); | |
| $this->_eatQuote(); | |
| $className = $this->_eatString($classNameLen); | |
| $this->_eatQuote(); | |
| $this->_eatColon(); | |
| $len = $this->_eatInt(); | |
| $this->_eatColon(); | |
| $this->_eatBraceOpen(); | |
| $subThings = ''; | |
| for ($i = 0; $i < ($len*2); $i++) { | |
| $subThings .= $this->_eat(); | |
| } | |
| $this->_eatBraceClose(); | |
| return 'O:' . $classNameLen . ':"' . $className . '":' . $len . ':{' . $subThings . '}'; | |
| case 'N': | |
| $this->_eatSemicolon(); | |
| return 'N;'; | |
| default: | |
| throw new Exception("Encountered unknown type [" . $type . "]"); | |
| } | |
| if ('' != $this->_input) { | |
| throw new Exception("Found garbage at end."); | |
| } | |
| } | |
| } |
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