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PHP怎么去掉转义

Jun 13, 2016 pm 01:07 PM
get magic php quotes

PHP如何去掉转义

string addslashes ( string str)

返回字符串,该字符串为了数据库查询语句等的需要在某些字符前加上了反斜线。

这些字符是单引号(\')、双引号(\")、反斜线(\\)与 NUL(NULL 字符)

stripslashes作用相反在处理mysql和GET、POST的数据时,常常要对数据的引号进行转义操作。

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PHP中有三个设置可以实现自动对’(单引号),”(双引号),\\(反斜线)和 NULL 字符转义。?

PHP称之为魔术引号,这三项设置分别是 magic_quotes_gpc 影响到 HTTP 请求数据(GET,POST 和 COOKIE)。不能在运行时改变。在 PHP 中默认值为 on。

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magic_quotes_runtime 如果打开的话,大部份从外部来源取得数据并返回的函数,包括从数据库和文本文件,所返回的数据都会被反斜线转义。该选项可在运行的时改变,在 PHP 中的默认值为 off。

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magic_quotes_sybase 如果打开的话,将会使用单引号对单引号进行转义而非反斜线。此选项会完全覆盖 magic_quotes_gpc。如果同时打开两个选项的话,单引号将会被转义成 ”。而双引号、反斜线 和 NULL 字符将不会进行转义。虽然方便的实现了对特殊符号的自动转义,但是这样会使得程序效率降低,并导致程序可移植变得麻烦。

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在不知道服务器ini设置的情况 下,还需要调用get_magic_quotes_gpc() ,get_magic_quotes_runtime() 或ini_get()来检测状态。

使用stripslashes去掉转义

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