Using PHP SDK from Facebook to upload a photo.

upload.php

<?php
if(isset($_FILES["source"]["name"]))
{
    try {
        $facebook->setFileUploadSupport(true);
        $response = $facebook->api(
          '/me/photos/',
          'post',
          array(
            'message' => $_POST['message'],
            'source' => '@'.$_FILES["source"]["tmp_name"]
          )
        );
      }
      catch (FacebookApiException $e) {
        error_log('Could not post image to Facebook.');
      }
}