PHP embeding Youtube and Vimeo clips from url

func.php

<?php
function url($string, $width = 550, $height = 309)
    {
	if(isset($string)){


		if(preg_match_all('/(http|https)\:\/\/[a-zA-Z0-9\-\.]+\.[a-zA-Z]{2,6}(\/\S*)+?/', $string, $matches)){

			foreach($matches as $value){
				foreach($value as $key) {
					//youtube clip
					if(filter_var($key, FILTER_VALIDATE_URL) !== false) {

						$url = parse_url($key);

						if (strpos($url['host'], 'youtube') !== false) {

							parse_str(parse_url($key, PHP_URL_QUERY), $vars);
							$string = str_replace($key, '<iframe width="' . $width . '" height="' . $height . '" src="https://www.youtube.com/embed/' . $vars['v'] . '" frameborder="0" allowfullscreen></iframe>', $string);

						} //vimeo clip
						elseif (strpos($url['host'], 'vimeo') !== false) {

							$v = substr($url['path'], 1);
							$string = str_replace($key, '<iframe src="https://player.vimeo.com/video/' . $v . '" width="' . $width . '" height="' . $height . '" frameborder="0" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>', $string);


						} else {

							$string = str_replace($key, '<a href="'.$key.'">'.$key.'</a>', $key);

						}
					}
				}

			}

		}

		unset($v, $value, $key, $vars);
	}

return $string;
}

Now the script works perfectly! Yeah