WP Get YouTube ID

wp-get-youtube-id.php

<?php
/**
 * Plugin Name: WP Get YouTube ID
 * Plugin URI:  https://gist.github.com/19h47/f7c768f1541f191cddf993a68d334415
 * Description: WordPress insert image.
 * Version:     0.0.0
 * Author:      Jérémy Levron
 * Author URI:  https://19h47.fr
 */

if ( ! function_exists( 'get_youtube_id_from_url' ) ) {
	/**
	 * Get YouTube ID from URL.
	 *
	 * @see https://gist.github.com/MarioRicalde/1163103
	 *
	 * @param string $url YouTube URL.
	 */
	function get_youtube_id_from_url( string $url ) : string {
		// Regular Expression (the magic).
		$regexp = '/^https?:\/\/(?:www\.)?(?:youtube\.com|youtu\.be)\/(?:watch\?(?=.*v=([\w\-]+))(?:\S+)?|([\w\-]+))$/i';

		// Match a URL.
		preg_match( $regexp, $url, $matches );

		// Remove empty values from the array (regexp shit).
		$matches = array_filter(
			$matches,
			function( $var ) {
				return '' !== $var;
			}
		);

		// If we have 2 elements in array, it means we got a valid url!
		// $matches[1] is the youtube ID!
		if ( count( $matches ) === 2 ) {
			return $matches[1];
		}

		return '';
	}
}


if ( ! function_exists( 'get_youtube_id_from_iframe' ) ) {
	/**
	 * Get YouTube Id from iframe.
	 *
	 * @param string $iframe iframe YouTube
	 *
	 * @see https://stackoverflow.com/a/41544603/5091221
	 *
	 * @return string
	 */
	function get_youtube_id_from_iframe( string $iframe ) : string {
		if ( ! is_string( $iframe ) ) {
			return '';
		}

		// Extract video url from embed code.
		return preg_replace_callback(
			'/<iframe\s+.*?\s+src=(".*?").*?<\/iframe>/',
			function ( $matches ) {

				$url = $matches[1];
				$url = trim( $url, '"' );
				$url = trim( $url, "'" );

				preg_match( "/^(?:http(?:s)?:\/\/)?(?:www\.)?(?:m\.)?(?:youtu\.be\/|youtube\.com\/(?:(?:watch)?\?(?:.*&)?v(?:i)?=|(?:embed|v|vi|user)\/))([^\?&\"'>]+)/", $url, $video_id );

				return isset( $video_id[1] ) ? $video_id[1] : '';
			},
			$iframe
		);

	}
}