Get images with multi ascending name

/* Get image from HTTP with ascending name */

/* Example
https://example.com/images/0/0
https://example.com/images/0/1
https://example.com/images/1/0
https://example.com/images/1/1
*/

for( $y = 0; $y <= 250; $y++ ) {

for( $x = 0; $x <= 10; $x++ ) {

$url = 'https://example.com/images/' . $y . '/' . $x . '.jpeg';

$locationURL = 'images/' . $y . '-' . $x . '.jpeg';

$file_headers = get_headers($url);

if(strpos($file_headers[0], '404') !== false){
echo $url . " Doesn't exist !<br/>";
} else {

$image = file_get_contents($url);

$img = new Imagick();

$img->readImageBlob($image);

$img->writeImage ($locationURL);

$img -> destroy();
}

}

}