[WordPress] Get Facebook Page Likes and Cache them

WP_get_facebook_page_likes.php

<?php
    // Get a user Access Token (or Page Token if you're the page admin)
    // https://developers.facebook.com/tools/explorer/145634995501895/
    
    function get_fb_likes($what) {
	$token = 'your_token_here';
	//delete_transient('cached_fb');
	if(false === ( $cached_fb_results = get_transient( 'cached_fb' ))) {
		$json_url = 'https://graph.facebook.com/v2.5/'.$what.'?fields=likes&access_token='.$token;
		$json = file_get_contents($json_url);
		if($json) {
			$json_output = json_decode($json);
			set_transient( 'cached_fb', $json_output, 60*60*12 );
			if($json_output->likes){
				return $json_output->likes;
			}
		}
	} else {
		if($cached_fb_results->likes){
			return $cached_fb_results->likes;
		}
	}
}

// Use where you want like this
$page_id = '54353388793'; // Go to your page, check at the bottom for Facebook Page ID https://www.facebook.com/yourpage/info/?tab=page_info
echo get_fb_likes($page_id);

?>