Video Sitemap using ACF field for YouTube Video on HikingGuy.com

functions.php

// ****************************************************************************************************	
// Video Sitemap

add_action( "save_post", "eg_create_sitemap" );   

function eg_create_sitemap() {

  // youtube_video is the ACF video where I store the normal YouTube link

	$args = array(
		'posts_per_page'      => -1,
		'post_type'		=> 'post', 
		'meta_query'	=> array(
			array(
				'key'	 	=> 'youtube_video',
				'value'	  	=> '',
				'compare' 	=> '!=',
			),
		),		
				
	);
	
	$the_query = new WP_Query( $args );
	
	if( $the_query->have_posts() ):  
    
	    $sitemap = '<?xml version="1.0" encoding="UTF-8"?>';
	    $sitemap .= "\n" . '<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xmlns:video="http://www.google.com/schemas/sitemap-video/1.1"> ' . "\n";    
	    
	    while( $the_query->have_posts() ) : $the_query->the_post();
	    	    
	    	preg_match("#(?<=v=)[a-zA-Z0-9-]+(?=&)|(?<=v\/)[^&\n]+(?=\?)|(?<=v=)[^&\n]+|(?<=youtu.be/)[^&\n]+#", get_field('youtube_video') , $matches);
			$videoID = $matches[0];
	    
        // Enter your API key in this string
	    	$json_url = 'https://www.googleapis.com/youtube/v3/videos?id=' . $videoID . '&key=[your key]&fields=items(id,snippet,contentDetails,statistics)&part=snippet,contentDetails,statistics';

			$json = file_get_contents($json_url);
			$json_output = json_decode($json);
	
			if($json_output->items[0]->statistics->viewCount){
				$viewCount = $json_output->items[0]->statistics->viewCount;
				$title = $json_output->items[0]->snippet->title;
				$duration = $json_output->items[0]->contentDetails->duration;
				$duration = ISO8601ToSeconds($duration);

			}
	    
	    
			$postdate = explode( " ", $post->post_modified );   
			$sitemap .= "\t" . '<url>' . "\n" .
				"\t\t" . '<loc>' . get_permalink( $post->ID ) . '</loc>' .
				"\n\t\t" . '<video>' .
				"\n\t\t\t" . '<video:thumbnail_loc>https://i.ytimg.com/vi/' . $videoID . '/hqdefault.jpg</video:thumbnail_loc>' .
				"\n\t\t\t" . '<video:title><![CDATA[' . $title . ']]></video:title>' .
				"\n\t\t\t" . '<video:description><![CDATA[' . get_the_excerpt($post->ID ) . ']]></video:description>' .
				"\n\t\t\t" . '<video:player_loc allow_embed="yes" autoplay="ap=1">' . get_field('youtube_video') . '</video:player_loc>' .
				"\n\t\t\t" . '<video:duration>' . $duration . '</video:duration>' .
				"\n\t\t\t" . '<video:view_count>' . $viewCount . '</video:view_count>' .
				"\n\t\t\t" . '<video:rating>5.0</video:rating>' .
				"\n\t\t\t" . '<video:category><![CDATA[Travel & Events]]></video:category>' .
				"\n\t\t" . '</video>' .
				"\n\t" . '</url>' . "\n";

	    
	    endwhile;
	    
	    $sitemap .= '</urlset>'; 
	    
	endif;
	    
        
    $fp = fopen( ABSPATH . "video-sitemap.xml", 'w' );
    fwrite( $fp, $sitemap );
    fclose( $fp );
}