想利用2.php对1.php进行过滤，请问如何编写2.php

<?

	$tplFile = "1.php";

	$fp = fopen($tplFile, 'r');

		

   //读取数据

    $template = fread($fp, filesize($tplFile));

    

    //替换数据 

    $template = preg_replace("/1/s", "2", $template);

    

    //输出

    echo $template;

 

?>