Show latest post from Facebook page

latest-facebook-post.php

<?php
/*
 * After finding the Facebook API docs to be inaccurate,
 * and being forced to use the API to get a single latest post dynamically.
 * API v5
 */

// Using Composer for Facebook PHP SDK
require_once( ABSPATH . '/vendor/autoload.php' );

$fb = new Facebook\Facebook(array(
  'app_id' => '{app_id}',
  'app_secret' => '{app_secret}',
  'default_graph_version' => 'v2.5',
));

$fbApp = $fb->getApp();
$accessToken = $fbApp->getAccessToken();

$request = $fb -> sendRequest(
  'GET',
  '/{page_id}/posts',
	array(
		'limit' => '1'
	),
	$accessToken
);
$response = $request->getDecodedBody();

$ids = array('','');
$i = 0;

if( $response ):
	if( is_array( $response ) &&
			isset( $response['data'] ) &&
			isset( $response['data'][$i] ) &&
			isset( $response['data'][$i]['id'] )
		):
		$ids = explode( '_', $response['data'][$i]['id'] );
	endif;
endif;

$facebook_post_url = 'https://www.facebook.com/' . $ids[0] . '/posts/' . $ids[1] ;
?>
<div class="fb-post" data-href="<?php echo $facebook_post_url ?>" data-width="500" ></div>
<div id="fb-root"></div>
<script>(function(d, s, id) {
  var js, fjs = d.getElementsByTagName(s)[0];
  if (d.getElementById(id)) return;
  js = d.createElement(s); js.id = id;
  js.src = "//connect.facebook.net/en_US/all.js#xfbml=1&amp;version=v2.2";
  fjs.parentNode.insertBefore(js, fjs);
  }(document, 'script', 'facebook-jssdk'));</script>