Get a facebook token and posts from a facebook page

get_facebook_token.php

<?php
$tokenUrl = 'https://graph.facebook.com/oauth/access_token?client_id={client_id}&client_secret={client_secret}&grant_type=client_credentials';
$token = file_get_contents($tokenUrl);

$postsUrl = 'https://graph.facebook.com/{page_id or slug}/posts?' . $token;
$postsJson = file_get_contents($postsUrl);

$posts = json_decode($postsJson);