<?php 
$curl = curl_init();
curl_setopt($curl, CURLOPT_URL,"http://ats.vimeo.com/659/581/65958109_640.jpg");
curl_setopt($curl, CURLOPT_HEADER,1);
curl_setopt($curl, CURLOPT_FOLLOWLOCATION,1);
curl_setopt($curl, CURLOPT_RETURNTRANSFER,1);
$veri=curl_exec($curl);

$desen = '#Content-Type: image/(.*?)#si';
if(preg_match($desen,$veri)){
echo 'resim var';
}else{
echo 'resim yok';
}
curl_close($curl);
?>