ifhub.club/application/install/bootstrap.php

<?php

define('INSTALL_DIR',dirname(__FILE__));
define('VERSION','2.0.0');

function install_func_underscore($sStr) {
	return strtolower(preg_replace('/([^A-Z])([A-Z])/',"$1_$2",$sStr));
}

function install_func_camelize($sStr) {
	$aParts = explode('_',$sStr);
	$sCamelized = '';
	foreach($aParts as $sPart) {
		$sCamelized .= ucfirst($sPart);
	}
	return $sCamelized;
}

/**
 * Загрузка классов инсталлятора
 * пример - InstallCore, InstallStepInit
 *
 * @param $sClassName
 * @return bool
 */
function install_autoload($sClassName) {
	$aPath=explode('_',install_func_underscore($sClassName));
	if (count($aPath)<2 or $aPath[0]!='install') {
		return;
	}
	array_shift($aPath);
	if ($aPath[0]=='step' and count($aPath)>1) {
		array_shift($aPath);
		$sDir='step';
		$sName=ucfirst(install_func_camelize(join('_',$aPath)));
		$sName{0}=strtolower($sName{0});
	} else {
		$sName=array_pop($aPath);
		$sDir=join(DIRECTORY_SEPARATOR,$aPath);
	}
	$sPath=dirname(__FILE__).DIRECTORY_SEPARATOR.'backend'.DIRECTORY_SEPARATOR.($sDir ? $sDir.DIRECTORY_SEPARATOR : '').$sName.'.php';
	if (file_exists($sPath)) {
		require_once($sPath);
		return true;
	}
	return false;
}

/**
 * Подключаем загрузкик классов
 */
spl_autoload_register('install_autoload');