php convert link to embed youtube
function convertYoutube($string) {
return preg_replace(
"/\s*[a-zA-Z\/\/:\.]*youtu(be.com\/watch\?v=|.be\/)([a-zA-Z0-9\-_]+)([a-zA-Z0-9\/\*\-\_\?\&\;\%\=\.]*)/i",
"<iframe src=\"//www.youtube.com/embed/$2\" allowfullscreen></iframe>",
$string
);
}