ZapMachine/conf/init.php

<?php
include_once 'conf.php';

/**
 * Define some app-wide constants
 */
define('ZAP_APP_BASE_DIR', realpath('.' . DIRECTORY_SEPARATOR . '..'));
define('ZAP_WEB_DIR', 'www');
define('ZAP_RESOURCE_DIR', 'resource');
define('ZAP_UTILS_DIR', 'utils');
define('ZAP_SESSIONS_DIR', 'sessions');
define('ZAP_LIB_DIR', 'lib');
define('ZAP_CONF_DIR', 'conf');
define('ZAP_TPL_DIR', 'tpl');

/**
 * Error decoration
 */
define('ERROR_PREFIX', 'ZAP Error: ');

/**
 * Set include path for application
 */
function setZAPIncludePath() {
	$app_dirs = array(ZAP_RESOURCE_DIR, ZAP_UTILS_DIR, ZAP_SESSIONS_DIR,
					 ZAP_LIB_DIR, ZAP_TPL_DIR, ZAP_CONF_DIR);
	$app_include_path = '';

	foreach ($app_dirs as $app_dir) {
		$app_include_path .= PATH_SEPARATOR . ZAP_APP_BASE_DIR . DIRECTORY_SEPARATOR . $app_dir;
	}

	if (set_include_path(get_include_path() . $app_include_path) == false) {
		throw new Exception(ERROR_PREFIX . 'Error while creating include path...');
	}

	define('ZAP_INCLUDE_PATH_SET', true);
	return;
}

/**
 * Initiate autoload function for application
 */
spl_autoload_register(function ($class_name) {
	if (!defined('ZAP_INCLUDE_PATH_SET') || ZAP_INCLUDE_PATH_SET === false) {
		try {
			setZAPIncludePath();
		} catch (Exception $e) {
			echo $e->getMessage();
			die();
		}
	}

	$include_path = get_include_path();
	$include_path_tokens = explode(PATH_SEPARATOR, $include_path);

	foreach ($include_path_tokens as $prefix) {
		$path[0] = $prefix . DIRECTORY_SEPARATOR . $class_name . '.interface.php';
		$path[1] = $prefix . DIRECTORY_SEPARATOR . $class_name . '.class.php';

		foreach ($path as $thisPath) {
			if (file_exists($thisPath)) {
				require_once $thisPath;
				return;
			}
		}
	}
});

/**
 * Define remaining app-wide constants
 */
define('ZAP_MOMENT', date("Y-m-d-H_i_s"));
define('ZAP_VERSION', '0.9.0');
define('ZAP_SESSION_NAME', 'ZAP');

// Only start session in web mode (not CLI)
if (php_sapi_name() !== 'cli') {
	Session::start(ZAP_SESSION_NAME);
}

/**
 * returns string of path of template file
 * @return string
 */
function getZAPTemplate($tplname) {
	if (!defined('ZAP_APP_BASE_DIR')) {
		throw new Exception(ERROR_PREFIX . 'No base directory defined?!');
	}
	$tplfile = $tplname . '.tpl';
	$tplfilepath = ZAP_APP_BASE_DIR . DIRECTORY_SEPARATOR
				 . ZAP_TPL_DIR . DIRECTORY_SEPARATOR . $tplfile;
	if (file_exists($tplfilepath)) {
		return $tplfilepath;
	} else {
		return ERROR_PREFIX . 'No template';
	}
}
?>