add a youtube video preloader function, lazy load youtube [fixed]

HTML

<iframe
  width="560"
  height="315"
  src="https://www.youtube.com/embed/Y8Wp3dafaMQ"
  srcdoc="<style>*{padding:0;margin:0;overflow:hidden}html,body{height:100%}img,span{position:absolute;width:100%;top:0;bottom:0;margin:auto}span{height:1.5em;text-align:center;font:48px/1.5 sans-serif;color:white;text-shadow:0 0 0.5em black}</style><a href=https://www.youtube.com/embed/Y8Wp3dafaMQ?autoplay=1><img src=https://img.youtube.com/vi/Y8Wp3dafaMQ/hqdefault.jpg alt='Video The Dark Knight Rises: What Went Wrong? – Wisecrack Edition'><span>▶</span></a>"
  frameborder="0"
  allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture"
  allowfullscreen
  title="The Dark Knight Rises: What Went Wrong? – Wisecrack Edition"
></iframe>

PHP

/* Here is the original embed function */
function youtube_thumbnail($url = "", $ttype = "hqthumb", $height = "420", $autoplay = false) {
	$url_array = parse_url($url);
	if(!is_array($url_array)) {
		return false;
	}
	if(!isset($url_array["query"])) {
		return false;
	}
	parse_str($url_array["query"],$query_string_array); // pass into array rather than variables.
	// var_dump($query_string_array);
	if(!isset($query_string_array['v'])) { return false; }
	$v = $query_string_array['v'];

	$thumb = "";
	if($ttype == "default") {
		$thumb = "https://img.youtube.com/vi/$v/default.jpg";
	}
	if($ttype == "hqthumb") {
		$thumb = "https://img.youtube.com/vi/$v/hqdefault.jpg";
	}
	if($ttype == "iframe") {
		$thumb = "<iframe width='100%' height='$height' src='https://www.youtube.com/embed/$v?rel=0' frameborder='0' allowfullscreen></iframe>";
		if($autoplay) {
			$thumb = "<iframe width='100%' height='$height' src='https://www.youtube.com/embed/$v?rel=0&autoplay=1' frameborder='0' allowfullscreen></iframe>";
		}
	}
	return $thumb;
}


// added an iframe_lazy option to this function
    if($ttype == "iframe_lazy") {
      $thumb = '<iframe width="560" height="'.$height.'" src="https://www.youtube.com/embed/'. $v .'?rel=0" srcdoc="<style>*{padding:0;margin:0;overflow:hidden}html,body{height:100%}img,span{position:absolute;width:100%;top:0;bottom:0;margin:auto}span{height:1.5em;text-align:center;font:48px/1.5 sans-serif;color:white;text-shadow:0 0 0.5em black}</style><a href=https://www.youtube.com/embed/'. $v .'?autoplay=1><img src=https://img.youtube.com/vi/'. $v .'/hqdefault.jpg><span>▶</span></a>" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>';
  	}

// new function
function youtube_thumbnail($url = "", $ttype = "hqthumb", $height = "420", $autoplay = false) {
	$url_array = parse_url($url);
	if(!is_array($url_array)) {
		return false;
	}
	if(!isset($url_array["query"])) {
		return false;
	}
	parse_str($url_array["query"],$query_string_array); // pass into array rather than variables.
	// var_dump($query_string_array);
	if(!isset($query_string_array['v'])) { return false; }
	$v = $query_string_array['v'];

	$thumb = "";
	if($ttype == "default") {
		$thumb = "https://img.youtube.com/vi/$v/default.jpg";
	}
	if($ttype == "hqthumb") {
		$thumb = "https://img.youtube.com/vi/$v/hqdefault.jpg";
	}
	if($ttype == "iframe") {
		$thumb = "<iframe width='100%' height='$height' src='https://www.youtube.com/embed/$v?rel=0' frameborder='0' allowfullscreen></iframe>";
		if($autoplay) {
			$thumb = "<iframe width='100%' height='$height' src='https://www.youtube.com/embed/$v?rel=0&autoplay=1' frameborder='0' allowfullscreen></iframe>";
		}
	}
    if($ttype == "iframe_lazy") {
      $thumb = '<iframe width="560" height="'.$height.'" src="https://www.youtube.com/embed/'. $v .'?rel=0" srcdoc="<style>*{padding:0;margin:0;overflow:hidden}html,body{height:100%}img,span{position:absolute;width:100%;top:0;bottom:0;margin:auto}span{height:1.5em;text-align:center;font:48px/1.5 sans-serif;color:white;text-shadow:0 0 0.5em black}</style><a href=https://www.youtube.com/embed/'. $v .'?autoplay=1><img src=https://img.youtube.com/vi/'. $v .'/hqdefault.jpg><span>▶</span></a>" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>';
  	}
	return $thumb;
}