Search for a string in 250 files

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PHP

hello
i want to do a php script that searches for a string in 250 files in a directory
i can do this but only on 1 file using this code

<?
$mcc=$_REQUEST[mcc];
$mnc=$_REQUEST[mnc];
$file = "http://******************/data/MEP-09070-001";
$file2=file_get_contents($file);
if(!strpos($file2, "MCC=$mcc
MNC=$mnc")) {
echo "String not found!";
}
else{echo "String found!";
echo "<br />";
$file = str_replace("*************/data/", "", $file);
echo $file;}

?> 

Pleaseeee help
Thanks in advance