PHP别名@函数 [英] PHP alias @ function

问题描述

我是PHP的新手，我很困惑看到一些示例调用带有@前缀的函数，例如@mysql_ping().

I'm new to PHP and I'm confused seeing some examples calling a function with a @ prefix like @mysql_ping().

它是做什么用的?谷歌搜索/搜索并没有多大帮助，因为@会被丢弃并且'alias'关键字不够好.

What is it for? Googling / searching is not much of a help since @ gets discarded and 'alias' is not good enough keyword.

推荐答案

@禁止显示错误，警告和通知.

@ suppresses errors, warnings and notices.

如果通过自定义错误处理程序或适当检查$ php_errormsg变量，以便您可以正确处理错误.

You can use it for good purpose if you complement it with a custom error handler or with due check of $php_errormsg variable so you can handle errors properly.

根据我的经验，这种正确用法很少见，反而以不好的方式被大量使用，只是隐藏错误而不对错误采取行动.

In my experience, this proper usage is not seen very much and is instead used a lot in the bad way, just to hide errors without acting on them.

更多信息，请访问 http://www.php.net/manual/zh-CN/language.operators.errorcontrol.php

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