autoload.php

<?php

$dir       = getcwd();
$prev      = '.';
$vendorDir = null;
$zf2Path   = false;

while (!is_dir($dir . '/vendor')) {
    $dir = dirname($dir);
    if ($prev === $dir) {
        return false;
    }
    $prev = $dir;
}

$vendorDir = $dir . '/vendor';

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

if (is_dir($vendorDir . '/ZF2/library')) {
    $zf2Path = $vendorDir . '/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);
    } 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.');
}