PHP - Zend 说避免魔术方法? [英] PHP - Zend say avoid Magic Methods?

问题描述

我正在阅读此页面 - http://deaduseful.com/blog/posts/50-php-optimisation-tips-revisited

其中一项建议是避免使用魔术方法，引用自 Zend Performance PDF，但没有理由建议避免使用它们.

经过一些 Google 搜索(并在此处结束了一个不相关的问题)后，我想知道是否有人在这方面有任何建议?

我在代码中经常使用 __get()，通常是为了保存我不总是使用的变量，例如

我可能有一个包含名称、desc、category_id、time_ added 的表

我的 get 看起来像这样:

<前>公共函数 __get($name) {开关($名称){案例名称":案例desc":案例类别":案例时间添加":$result = do_mysql_query();$this->name = $result['name'];$this->desc = $result['desc'];$this->category = $result['category'];$this->time_ added = $result['time_ added'];返回 $this->{$name};休息;默认:throw Exception("试图访问不存在的或私有的财产 - ".$name);}}

这似乎是一种很好的做事方式，因为我只在需要时才从数据库中获取一些东西，而且我可以引用诸如 $article->time_ added 之类的东西，而不是摆弄数组.

这是否会被认为是不好的做法和服务器上的额外负载?

通常我会用魔法方法扩展类，如果子类与 get 中的某些内容不匹配，我会做这样的事情.

<前>公共函数 __get($name) {开关($名称){案例名称":案例desc":案例类别":案例时间添加":$result = do_mysql_query();$this->name = $result['name'];$this->desc = $result['desc'];$this->category = $result['category'];$this->time_ added = $result['time_ added'];返回 $this->{$name};休息;默认:return parent::__get($name);}}

这会是不好的做法并且对性能不利吗?我在扩展魔法方法时的最大级别数是三个.

解决方案

确实，它们更慢……但差异非常小，以至于速度与代码是一个因素.是否值得为更快的开发和维护而担心差异?

查看magic benchmarks了解统计数据

I was reading this page - http://deaduseful.com/blog/posts/50-php-optimisation-tips-revisited

And one of the recommendations was to avoid using Magic Methods, cited from a Zend Performance PDF which gives no reason for its recommendation to avoid them.

After some Google searching (and winding up here to an unrelated question) I wondered if anyone had any reccomendations on that front?

I use __get() alot in my code, usually to save variables that I don't always use e.g.

I may have a table with name, desc, category_id, time_added

My get would look something like this:

public function __get($name) {
    switch($name) {
        case 'name':
        case 'desc':
        case 'category':
        case 'time_added':
            $result = do_mysql_query();
            $this->name = $result['name'];
            $this->desc = $result['desc'];
            $this->category = $result['category'];
            $this->time_added = $result['time_added'];
            return $this->{$name};
        break;
        default:
            throw Exception("Attempted to access non existant or private property - ".$name);
    }
}

This seems like a great way to do things as I only ever get something from the database if it's needed and I can refence things like $article->time_added rather than fiddling around with arrays.

Would this be considered bad practice and an extra load on the server?

Often I will extend classes with magic methods and do something like this if the child class doesn't match something in a get.

public function __get($name) {
    switch($name) {
        case 'name':
        case 'desc':
        case 'category':
        case 'time_added':
            $result = do_mysql_query();
            $this->name = $result['name'];
            $this->desc = $result['desc'];
            $this->category = $result['category'];
            $this->time_added = $result['time_added'];
            return $this->{$name};
        break;
        default:
            return parent::__get($name);
    }
}

Would this be bad practice and bad for performance? The maximum number of levels I have when extending magic methods is three.

解决方案

It's true, they are slower... but the difference is so tiny that speed vs code is a factor. Is it worth worrying about the difference for quicker development and maintenance?

See magic benchmarks for stats

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