autoload.php

<?php
/**
 * PostFinance Checkout SDK
 *
 * This library allows to interact with the PostFinance Checkout payment service.
 *
 * 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.
 */


/**
 * Autoload function.
 *
 * @author   wallee AG
 
 * After registering this autoload function with SPL, the following line
 * would cause the function to attempt to load the \PostFinanceCheckout\Sdk\Baz\Qux class
 * from /path/to/project/lib/Baz/Qux.php:
 *
 *	  new \PostFinanceCheckout\Sdk\Baz\Qux;
 *
 * @param string $class the fully-qualified class name.
 */
spl_autoload_register(function ($class) {

	// project-specific namespace prefix
	$prefix = 'PostFinanceCheckout\\Sdk\\';

	// base directory for the namespace prefix
	$baseDir = __DIR__ . '/lib/';

	// does the class use the namespace prefix?
	$len = strlen($prefix);
	if (strncmp($prefix, $class, $len) !== 0) {
		// no, move to the next registered autoloader
		return;
	}

	// get the relative class name
	$relativeClass = substr($class, $len);

	// replace the namespace prefix with the base directory, replace namespace
	// separators with directory separators in the relative class name, append
	// with .php
	$file = $baseDir . str_replace('\\', '/', $relativeClass) . '.php';

	// if the file exists, require it
	if (file_exists($file)) {
		require $file;
	}
}, true, true);