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php at(@)符号的用法 - 站长搜索
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php at(@)符号的用法

PHP 2014-12-11 07:48:03 转载来源: 网络整理/侵权必删

本文为大家讲解了php下的@符号(at符号)的用法,在php下@符号可以用来屏蔽错误,感兴趣的同学参考下. 对于php的初学者,经常会看到在一个函数名字前面有一个at(@)符号,但是不知道它的作用和用法,去掉后好像对程序没有什么影响,感到很困惑,简单的说@可以忽略错误,有仰制错误的功能为错误控制操作符

本文为大家讲解了php下的@符号(at符号)的用法,在php下@符号可以用来屏蔽错误,感兴趣的同学参考下.

对于php的初学者,经常会看到在一个函数名字前面有一个at(@)符号,但是不知道它的作用和用法,去掉后好像对程序没有什么影响,感到很困惑,简单的说@可以忽略错误,有仰制错误的功能为错误控制操作符.
下面介绍一下它的用法.

例如:


function db_connect()//连接数据库
{
@$db =mysql_connect('localhost','root','test');
if(!$db)
throw new Exception('连接数据库失败!请重试!');
mysql_select_db('book');
return $db;
}


如果连接数据库不成功的,前面的“@”就能把错误显示给抑制住,也就是不会显示错误,然后再抛出异常,显示自己定义的异常处理,添加这个只是为了让浏览者不看到,不友好的页面,并不能抑制住错误,只能抑制显示错误!@ 用在你觉得以后运行有可能会出现错误的地方 , @后面要来个空格!最好少用,好像增加系统开销.


标签: php at 号的 用法


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