autoload.php

<?php
/**
 *   Copyright 2014 Vimeo
 *
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 */

spl_autoload_register(function ($class) {
    // Make sure that the class being loaded is in the vimeo namespace
    if (substr(strtolower($class), 0, 6) !== 'vimeo\\') {
        return;
    }

    // Locate and load the file that contains the class
    $path = __DIR__ . '/src/' . str_replace('\\', '/', $class) . '.php';
    if (file_exists($path)) {
        require($path);
    }
});