PHPLock.php

<?php

class PHPLock {
	private $_PHP_LOCK = array();
	private $code;
	private $lockId = 1;

	public function __construct(&$code){
		$this->code =& $code;
		$this->_PHP_LOCK = array();
	}

	public function acquire(){
		$this->code = preg_replace_callback('/<\?php.+?\?>/is', array($this, '_lockContent'), $this->code);
	}

	public function release(){
		foreach($this->_PHP_LOCK as $LOCK_ID => $sourceCode){
			$this->code = str_replace($LOCK_ID, $sourceCode, $this->code);
		}
		$this->_PHP_LOCK = array();
	}

	private function _lockContent($matches){
		$LOCK = '___PHP_CODE_LOCK_'.($this->lockId++).'___';
		$this->_PHP_LOCK[ $LOCK ] = $matches[0];
		return $LOCK;
	}

	public function syncContent($newCode){
		$this->code = $newCode;
		return $this;
	}

	public function getContent(){
		return $this->code;
	}
}