autoload.php

<?php

/**
 * Tabs API Client autoloader.
 *
 * PHP Version 5.3
 *
 * @category  API_Client
 * @package   Tabs
 * @author    Alex Wyett <alex@wyett.co.uk>
 * @copyright 2013 Carlton Software
 * @license   http://www.php.net/license/3_01.txt  PHP License 3.01
 * @link      http://www.carltonsoftware.co.uk
 */

spl_autoload_register(
    function ($class) {

        // Project specific namespace
        $prefix = 'tabs\\api\\';

        // Base directory
        $base_dir = __DIR__ . '/src/';

        // Does the class use this namespace?
        $len = strlen($prefix);

        // @codeCoverageIgnoreStart
        if (strncmp($prefix, $class, $len) !== 0) {
            // no
            return;
        }
        // @codeCoverageIgnoreEnd

        // Replace namespace prefix with the base directory, replace namepace
        // separators with directory separators in teh relative class name,
        // append with .class.php
        $file = $base_dir . str_replace('\\', DIRECTORY_SEPARATOR, $class) . '.php';

        if (file_exists($file)) {
            include $file;
        }

    }
);