Php cek ketersediaan file di suatu server

<?php
    $url='http://url-file.com/file/downloads/misalnya-video.mp4';
    $file=@get_headers($url);
    if($file[0] == 'HTTP/1.0 404 Not Found'){
        echo'File tidak tersedia';
    }
    elseif($file[0] == 'HTTP/1.0 302 Found' && $file[7] == 'HTTP/1.0 404 Not Found'){
        echo'File tidak tersedia';
    } else {
        echo'File tersedia <a target="_blang" href="'.$url.'"> Cek</a>';
    }