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PHP表单提交后引号前自动加反斜杠的原因及三种办法关闭php魔术引号,提交后斜杠
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PHP表单提交后引号前自动加反斜杠的原因及三种办法关闭php魔术引号,提交后斜杠

Jun 13, 2016 am 08:53 AM
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PHP表单提交后引号前自动加反斜杠的原因及三种办法关闭php魔术引号,提交后斜杠

最近发现做一个php程序表单数据提交写入数据库的内容中只要是带有单引号或者双引号的内容时,后面都会增加一个反斜杠。而且每保存一次增加一个反斜杠,很是郁闷。

于是从网上搜了一下原来是PHP程序为了防止注入或者溢出,通过PHP 指令 magic_quotes_gpc自动在双引号、单引号、反斜杠、NULL前面添加反斜杠。

默认PHP 指令 magic_quotes_gpc是on的,也就是打开的。这时候就可以用stripslashes() 函数删除自动添加的反斜杠。用法就是:比如包含字符串的变量是$str,那么就用stripslashes() 函数处理一下这个字符串:stripslashes($str),输出的结果就是去掉反斜杠的。

于是我就把读取的字符串内容用stripslashes()函数处理一下,即$value=stripslashes($str),再保存。

但是又出现另外一个问题,那就是因为本地PHP 指令 magic_quotes_gpc是off的,如果用这个函数的话,就会把本来正常的反斜杠也去掉了。这样就不是我们所希望的了。

解决办法就是可以使用函数 get_magic_quotes_gpc() 进行检测,如果是打开的状态,那么就去除反斜杠,如果是关闭的状态,则不去除反斜杠。

程序代码如下:

$str=$_POST["str"];//读取str的内容赋值给$str变量
if(get_magic_quotes_gpc())//如果get_magic_quotes_gpc()是打开的
{$str=stripslashes($str);//将字符串进行处理
}
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下面介绍三种方法解决这个问题:

方法1:修改PHP配置文件php.ini

这种方法只适于自己有权管理服务器的情况下,如果用的虚拟空间,那就只能采用后两条方法。

在PHP配置文件php.ini中将magic_quotes_gpc、magic_quotes_runtime、magic_quotes_sybase全部设为off。如下所示:

magic_quotes_gpc = Off

magic_quotes_runtime = Off

magic_quotes_sybase = Off

方法2:利用.htaccess文件

该方法只在服务器支持htaccess的情况下,现在的服务器一般都会支持的

在程序目录下.htaccess文件中增加下面一句:

复制代码 代码如下:
php_flag magic_quotes_gpc Off

方法3: 在代码中屏蔽

该方法是移植性最强的,不用考虑服务器的配置,只要支持PHP就可以使用。

在所有PHP文件开始处增加下面代码

if(get_magic_quotes_gpc()){
   function stripslashes_deep($value){
     $value=is_array($value)?array_map('stripslashes_deep',$value):stripslashes($value);
     return $value;
   }
   $_POST=array_map('stripslashes_deep',$_POST);
   $_GET=array_map('stripslashes_deep',$_GET);
   $_COOKIE=array_map('stripslashes_deep',$_COOKIE);
   $_REQUEST=array_map('stripslashes_deep',$_REQUEST);
 }
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以上介绍就是本文给大家介绍的PHP表单提交后引号前自动加反斜杠的原因及三种办法关闭php魔术引号,希望大家喜欢。

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