public static function set_enquiry_dir($base) { if (defined('WPMU_PLUGIN_DIR') && file_exists(WPMU_PLUGIN_DIR . '/' . basename($base))) { self::$SP_enquiry_dir = trailingslashit(WPMU_PLUGIN_URL); } elseif (defined('WP_PLUGIN_DIR') && file_exists(WP_PLUGIN_DIR . '/sp_gfaddon/' . basename($base))) { self::$SP_enquiry_dir = trailingslashit(WP_PLUGIN_DIR . '/sp_gfaddon'); } else { self::$SP_enquiry_dir = trailingslashit(WP_PLUGIN_DIR . '/sp_gfaddon'); } }