WetCode

What i want it to do is to find all the lines that contains a row of numbers.
In this case no less then 4 numbers after etche other.

This is the code i got and it displays a blank page when the file contains 1234 in a line in the .txt file. tryd using it .rtf as well same result blank page.

Here is the Code:
<?php
// the file has been uploaded.
// (do it yourself)
$file = 'file.txt';
// the minimum length of each number
$min = 4;

$matches = array ();
foreach (file ($file) as $k => $line)
{
if (preg_match ('/^[\d]{' . $min . ',}+$/', $line))
{
$matches[] = $k;
}
}

if (sizeof ($matches))
{
// dumps line numbers with positive match
print_r ($matches);
}
?>

All help is most welcome.
Sorry if my gramma isent perfect i hawe some problems white spelling.