PHP adds backslash before quote (PHP removes backslash)

The reason why PHP adds a backslash before the quotation mark and how to remove the backslash in PHP. Three ways to turn off php magic quotes

The default PHP command magic_quotes_gpc in the server space provided by general space providers is on. That is, open. At this time, you can use the stripslashes() function to remove the automatically added backslashes. The usage is: for example, the variable containing the string is $str, then use the stripslashes() function to process the string: stripslashes($str), and the output result will be with the backslashes removed.

If you encounter the output result containing backslashes, you can use the stripslashes() function to process the output content, that is, $str=stripslashes($str), and save it to save the output content. Remove the backslash.

But there is another problem, that is because the local PHP instruction magic_quotes_gpc is off. If this function is used, the normal backslashes will be removed. This is not what we want.

The solution is to use the function get_magic_quotes_gpc() to detect. If it is in the open state, then the backslash is removed. If it is in the closed state, the backslash is not removed.

The program code is as follows:

Copy code The code is as follows:

 $str=$_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 
 }

This article was revised as follows at 10:08:03 on April 25, 2012:

The following are three methods to solve this problem:

1. Modify the PHP configuration file php.ini
This method is only suitable for those who have the authority to manage the server. In this case, if virtual space is used, only the last two methods can be used.
Set magic_quotes_gpc, magic_quotes_runtime, and magic_quotes_sybase all to off in the PHP configuration file php.ini. As shown below:

Copy code The code is as follows:

magic_quotes_gpc = Off 
magic_quotes_runtime = Off 
magic_quotes_sybase = Off

2 Use .htaccess file
This method only supports htaccess on the server In this case, current servers generally support
Add the following sentence to the .htaccess file in the program directory:

php_flag magic_quotes_gpc Off

3 Shield in the code
This method is the most portable. You don’t need to consider the server configuration. It can be used as long as it supports PHP.
Add the following code at the beginning of all PHP files

Copy code The code is as follows:

 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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