php获取环境是否安装zend optimizer

if (extension_loaded('Zend Optimizer') || extension_loaded('Zend Guard Loader') || get_cfg_var("zend_extension")||get_cfg_var("zend_optimizer.optimization_level")||get_cfg_var("zend_extension_manager.optimizer_ts")||get_cfg_var("zend_extension_ts")){$zend_optimizer = "";}