script execution from php

gistfile1.txt

    // convert
    $descriptorspec = array(
      0 => array("pipe", "r"),  // stdin
      1 => array("pipe", "w"),  // stdout
      2 => array("pipe", "w"),  // stderr
    );
    flush();
    $process = proc_open($youtdl, $descriptorspec, $pipes);
    if (is_resource($process)) {
      while ($s = fgets($pipes[1])) {
        print $s;
        flush();
      }
    }
    $stdout = stream_get_contents($pipes[1]);
    fclose($pipes[1]);
    $stderr = stream_get_contents($pipes[2]);
    fclose($pipes[2]);
    $ret = proc_close($process);
    // echo json_encode(array('status' => $ret, 'errors' => $stderr, 'url_orginal'=> $url, 'output' => $stdout, 'command' => $youtdl));