<?php
	
	function validate_youtube_url($url) {
		$oEmbed_end_point = "https://www.youtube.com/oembed?url=%s";
		
		$response = (object) array(
			"body" => file_get_contents(sprintf($oEmbed_end_point, $url)),
			"headers" => get_headers(sprintf($oEmbed_end_point, $url))
		);
		
		if(strstr(implode("\n", $response->headers), "200 OK") === false)
			return false;
		
		$response->body = json_decode($response->body, true);
		
		if(array_key_exists($response->body, "title") === false)
			return false;
		
		$response->body = json_decode(json_encode($response->body));
		
		$thumbnail_url = (object) parse_url($response->body->thumbnail_url);
		
		$thumbnail_url_path = explode("/", trim($thumbnail_url->path, "/"));
		
		return $thumbnail_url_path[1];
	}
	
	var_dump(validate_youtube_url("https://www.youtube.com/watch?v=Wg0EXjAX8zc"));