PHP删除当前目录下统计代码块

<?php	
 /***
	*  删除文件中百度统计代码
	*
	*/

	new delTJ();
	class delTJ  {
		
		private $dir = '.';    //文件存放的目录
		private $dirHandler;

		public function __construct() {
			$this->del();
		}


		private function del() {

			if(is_dir($this->dir)){
				echo '找到文件目录！';
				$this->dirHandler = opendir($this->dir);
				if($this->dirHandler){
					while (false !== ($file = readdir($this->dirHandler)) ) {
						if($file !== '.' && $file !== '..'){
							$filename = dirname(__FILE__).DIRECTORY_SEPARATOR.$file;
							echo $filename;
							$content = file_get_contents(dirname(__FILE__).DIRECTORY_SEPARATOR.$file);
							$content = preg_replace('/<!--mytest.com(.*)\n(.*)\n(.*)\n(.*)\n(.*)<\/script>/', '', $content);
							file_put_contents($filename,$content);
						}
					}
				}
			}

		}
	} 
?>