public static function init($pluginUrl, $pluginRoot, $pluginFile, $classesDir = '') { self::$classesDir = $classesDir; self::$pluginRoot = $pluginRoot; self::$pluginUrl = $pluginUrl; self::$pluginFile = $pluginFile; if (!isset(self::$classesDir) || !self::$classesDir) { self::$classesDir = dirname(__FILE__); } if (function_exists('spl_autoload_register')) { spl_autoload_register('Mvc::autoload'); } else { wp_die('This version of PHP is too old: ' . PHP_VERSION); } }