init_autoloader.php

<?php

/**
 * The MIT License
 *
 * Copyright (c) 2015, Coding Matters
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

/**
 * This autoloading setup is really more complicated than it needs to be for most
 * applications. The added complexity is simply to reduce the time it takes for
 * new developers to be productive with a fresh skeleton. It allows autoloading
 * to be correctly configured, regardless of the installation method and keeps
 * the use of composer completely optional. This setup should work fine for
 * most users, however, feel free to configure autoloading however you'd like.
 */

// Composer autoloading
if (file_exists('vendor/autoload.php')) {
    $loader = include 'vendor/autoload.php';
}

if (class_exists('Zend\Loader\AutoloaderFactory')) {
    return;
}

$zf2Path = false;

if (is_dir('vendor/ZF2/library')) {
    $zf2Path = 'vendor/ZF2/library';
} elseif (getenv('ZF2_PATH')) {      // Support for ZF2_PATH environment variable or git submodule
    $zf2Path = getenv('ZF2_PATH');
} elseif (get_cfg_var('zf2_path')) { // Support for zf2_path directive value
    $zf2Path = get_cfg_var('zf2_path');
}

if ($zf2Path) {
    if (isset($loader)) {
        $loader->add('Zend', $zf2Path);
        $loader->add('ZendXml', $zf2Path);
    } else {
        include $zf2Path . '/Zend/Loader/AutoloaderFactory.php';
        Zend\Loader\AutoloaderFactory::factory(array(
            'Zend\Loader\StandardAutoloader' => array(
                'autoregister_zf' => true
            )
        ));
    }
}

if (!class_exists('Zend\Loader\AutoloaderFactory')) {
    throw new RuntimeException('Unable to load ZF2. Run `php composer.phar install` or define a ZF2_PATH environment variable.');
}