Facebook GraphAPIのOAuthAccessToken(Expire: 2month)をgetするためのプログラム。 $client_id,$client_secret,$redirect_uriに適切な文字列をセット。 $redirect_uriにてアクセスできる場所に設置し、ブラウザから$redirect_uriにアクセスすると、Expire:2monthのAccessTokenを入手できる。

fb_2month_token_getter.php

<?php
//SETTINGS
//Facebook APP ID
$client_id = 'YOUR_APP_ID';
//Facebook APP SECRET
$client_secret = 'YOUR_APP_SECRET';
//WebURI to access this script
$redirect_uri = 'http://YOUR.DOMAIN/PATH/TO/this_script.php';
//Scopes U need
//Scopes: https://developers.facebook.com/docs/authentication/permissions/
$scope = 'publish_stream,manage_pages';

if(!isset($_GET['code'])){
  //Get Code to get short expire token
  header("Location: https://graph.facebook.com/oauth/authorize?client_id={$client_id}&redirect_uri={$redirect_uri}&scope={$scope}");
  exit();
}else{
  //Get short expire token
  $response = file_get_contents("https://graph.facebook.com/oauth/access_token?client_id={$client_id}&client_secret={$client_secret}&redirect_uri={$redirect_uri}&code={$_GET['code']}");
  if(preg_match('/access_token=([A-Za-z0-9]+)/',$response,$short_token)){
    $short_token = $short_token[1];
  }else{
    exit("couldn't get short expire token<br>\n");
  }

  //Get 2month expire token
  $response = file_get_contents("https://graph.facebook.com/oauth/access_token?client_id={$client_id}&client_secret={$client_secret}&grant_type=fb_exchange_token&fb_exchange_token={$short_token}");
  if(preg_match('/access_token=([A-Za-z0-9]+)/',$response,$exchange_token)){
    echo ($exchange_token = $exchange_token[1])."<br>\n";
  }else{
    exit("couldn't get exchange token<br>\n");
  }
}