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PHP中 @ at 记号的作用介绍 - 站长搜索
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PHP中 @ at 记号的作用介绍

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2014-12-11 01:18:05 转载来源: 网络整理/侵权必删

本文为大家讲解的是php中的@ at符号的用处和功能,@符号可以函数,方法前可以用来屏蔽错误,感兴趣的同学参考下. @符号一直不知道是什么意思,其实它是错误控制符,即即使出现错误,也无视出现的错误信息,继续执行下边的代码 看PHP的代码,总有些行前边有@符号,一直不知道是什么意思。 例如dede5.7 @ni=imagecreatetruecolor(ftoW,$ftoH); 今天用到了,就记一下吧

本文为大家讲解的是php中的@ at号的用处和功能,@符号可以函数,方法前可以用来屏蔽错误,感兴趣的同学参考下.

@符号一直不知道是什么意思,其实它是错误控制符,即即使出现错误,也无视出现的错误信息,继续执行下边的代码

PHP的代码,总有些行前边有@符号,一直不知道是什么意思。 例如dede5.7 @ni=imagecreatetruecolor(ftoW,$ftoH);

今天用到了,就记一下吧。其实它是错误控制符,即即使出现错误,也无视出现的错误信息,继续执行下边的代码。

@$page=$_GET['page']?intval($_GET['page']):1;

这句是从URL中获取page关键字的值,比如"index.php?page=5",则$page就会取到5。

但是如果有error,比如"index.php"后没有page关键字了,如果去取$_GET['page']不存在就会报错,这时有@就可以忽视这个小错误了。

又比如:

$conn = mysqli_conncet("q","w","e","r");

这样会输入错误信息,关于连接数据库方面的。

如果$conn前面加@的话就可以不让他输出错误信息了。

@$conn = mysqli_conncet("q","w","e","r");

 


标签: PHP at 号的 作用 介绍


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