youtube-dl with php

youtube.php

<?php

// Original: https://stackoverflow.com/a/15156424/1844007

if (isset($_POST['url']) && filter_var($_POST['url'], FILTER_VALIDATE_URL) ) {
    $url = filter_var($_POST['url'], FILTER_SANITIZE_URL);
    
    $template = '/var/www/html/uploads/%(title)s.%(ext)s';
    $string = ('youtube-dl ' . escapeshellarg($url) . ' --audio-format mp3 -o ' . escapeshellarg($template));

    $descriptorspec = [
        0 => array("pipe", "r"),  // stdin
        1 => array("pipe", "w"),  // stdout
        2 => array("pipe", "w"),  // stderr
    ];

    $process = proc_open($string, $descriptorspec, $pipes);

    $stdout = stream_get_contents($pipes[1]);
    fclose($pipes[1]);

    $stderr = stream_get_contents($pipes[2]);
    fclose($pipes[2]);

    $ret = proc_close($process);
    echo json_encode(['status'=>$ret,'errors'=>$stderr,'url'=>$url,'output' => $stdout,'command' => $string]);
}