YouTube URL replacer

gistfile1.txt

function ytEmbed($str) {
  $pattern = '/https?:\/\/(?:[0-9A-Z-]+\.)?(?:youtu\.be\/|youtube\.com(?:\/embed\/|\/v\/|\/watch\?v=|\/ytscreeningroom\?v=|\/feeds\/api\/videos\/|\/user\S*[^\w\-\s]|\S*[^\w\-\s]))([\w\-]{11})[?=&+%\w-]*/i';
  $found   = preg_match_all($pattern, $str, $matches);

  if ($found > 0) {
    foreach ($matches[0] as $k => $replaceThis) {
      $ytid        = $matches[1][$k];
      $replaceWith = '<div class="media"><div class="video-container"><iframe title="YouTube video" class="youtube-player" height="315" width="560" type="text/html" src="http://www.youtube.com/embed/'.$ytid.'" frameborder="0"></iframe></div></div>';
      $str     = str_replace($replaceThis, $replaceWith, $str);
    }
  }

  return($str);
}