<?php
$search = 'file';
$filename = "1.txt";
$handle = fopen($filename, "r");
$s = fread($handle, filesize($filename));
$a = strpos($s,$search);
If($a) $new = str($s,$a);
fclose($handle);
$handle1 = fopen("new.txt", "w");
fwrite($handle1,$new . "\r\n");
fclose($handle1);
?>