finder

finder.php

<?php
$find = preg_quote('search-term-what-to-find');

$dir='/home/user/public_html';
chdir($dir);

$files=array();
$files[] = 'file1.php';
$files[] = 'file2.php';
$files[] = 'path1/file3.php';
$files[] = 'path2/file4.php';
$files[] = 'path3/path4/file4.php';

$found=array();
foreach($files as $f => $file)
{
	$lines = file($file, FILE_IGNORE_NEW_LINES);
	foreach($lines as $l => $line)
	{
		if(preg_match("/{$find}/is", $line))
		{
			$found[$file][$l]=$line;
		}
	}
}

print_r($found);
?>