will-in-wi

<?php
$starting_links = array('http://a5.mzstatic.com/us/r1000/107/Music/v4/3a/1c/4b/3a1c4bff-7b99-2162-3036-54157c6924e6/0818610010094_1200x1200_300dpi.100x100-75.jpg',);

$timeout = 1; // In seconds

foreach ($starting_links as $link) {
    $curr_size = 25;    
    while ($curr_size < 2000) {
        $result = get_headers(str_replace('100x100', $curr_size . 'x' . $curr_size, $link));
        if ($result[0] === 'HTTP/1.0 404 Not Found') {