A Facebook fanpage feed parser built in PHP.

facebook_fanpage_parser.php

<?php 

  // Facebook Fanpage Parser
  // Author: Brian Weinreich
  // Company: Rounded
  // Website: http://roundedco.com
  // Make sure you read through this documentation before implementing!
  // Head to https://developers.facebook.com/apps and create a new app
  // Log in under Rounded Developments Facebook account (Ask Brian for creds if you don't know them)
  
  // Fill these in after creating your app
  $client_id = "";
  $client_secret = "";
  $fanpage_id = "";
  $access_token = ""; // if you have it stored in the db

  // Sends get requests and returns the data
  function get_data($url) {
     $ch = curl_init($url);
     curl_setopt($ch, CURLOPT_HEADER, 0);
     curl_setopt ($ch, CURLOPT_RETURNTRANSFER, true);
     $data = curl_exec($ch);
     curl_close($ch);
     return $data;
  }

  // Grabs your apps access token
  // If this fails, it will print the error and exit
  function get_access_token() {
    global $client_id;
    global $client_secret;
    $facebook_token_url = "https://graph.facebook.com/oauth/access_token?client_id=".$client_id."&client_secret=".$client_secret."&grant_type=client_credentials";
    $response = get_data($facebook_token_url);
    if(isset(json_decode($response)->error)) { echo $response; die; }
    return $response;
  }

  // Grab the fanpage feed based on the access token
  // If this fails, it will go and retrieve a new access token
  function get_fanpage_feed($access_token) {
    global $fanpage_id;
    $facebook_url = "https://graph.facebook.com/".$fanpage_id."/feed?".$access_token;
    $all_data = json_decode(get_data($facebook_url));

    // If there is an error, it might be the access token is expired... so get a new one
    if(isset($all_data->error)) { 
      $facebook_url = "https://graph.facebook.com/".$fanpage_id."/feed?".get_access_token();
      $all_data = json_decode(get_data($facebook_url));
    }

    // If there is ANOTHER error, it's probably cause the facebook url is poorly formatted. we'll print it out this time and kill the app.
    if(isset($all_data->error)) { 
      echo json_encode($all_data);
      die;
    }

    $all_data = $all_data->data;
    return $all_data;
  }


  // returns an array of the fanpage feed (runs through the above functions)
  $feed = get_fanpage_feed($access_token);

?>