addslashes,stripslashes

The official introduction ：
(PHP 4, PHP 5)
addslashes — Use backslashes to reference strings
Return string , This string adds a backslash before some characters for the needs of database query statements, etc . These characters are single quotes （’）、 Double quotes （”）、 Backslash （\） And NUL（NULL character ）.
PHP 5.4 Before PHP Instructions magic_quotes_gpc The default is on, Virtually all GET、POST and COOKIE Data are used by addslashes() 了 . Don't be right to have been magic_quotes_gpc Escaped strings use addslashes(), Because this will lead to double escape . In this case, you can use the function get_magic_quotes_gpc() To test .

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       // When magic_quotes_gpc=On When , function get_magic_quotes_gpc() It will return 1
       
       
// When magic_quotes_gpc=Off When , function get_magic_quotes_gpc() It will return 0
       
       
$str=$_POST["str"];// Read str The content of is assigned to $str Variable 
       
       
if(get_magic_quotes_gpc())// If get_magic_quotes_gpc() It's open 
       
       
{
       
       
$str=stripslashes($str);// Process strings 
       
       
}
      
      
      
      

       
       
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  that , The problem is coming. , Now use php5.6,get_magic_quotes_gpc() by false, But , Direct access to $_POST Value , Or just escaped , Why is that ？？？