Example of recursive escape of the addslashes array in php

I. Functions mainly involve the addslashes method.

The addslashes () function adds a backslash before the specified predefined character.

The predefined characters are:

• Single quotes (')
• Double quotation marks (")
• Backslash (\)
• NULL

II. array_map description

The array_map () function returns the array after the user-defined function is applied. The number of parameters accepted by the callback function should be the same as the number of arrays passed to the array_map () function.
If the passed parameters are in the array format, use the array_map method to escape the parameters.

We are developing variables such as $ _ GET and $ _ POST.

The code is as follows:	Copy code
/** * Recursively escape special characters in a variable  * * @ Access public * @ Param mix $ value  * * @ Return mix */ Function addslashes_deep ($ value) { If (empty ($ value ))  { Return $ value;  } Else  { Return is_array ($ value )? Array_map ('addslashes _ deep ', $ value): addslashes ($ value );  } }

If it is an array, the security escape cannot be completed. The following is an example. Let's take a look.

Method 3,You can refer to this recursive method to implement other functions. The code is as follows:

The code is as follows:

Copy code

<? Php $ Arr = array ('a "AA', array (" c 'd ", array ('E" f '))); Function changes ($ arr ){ Foreach ($ arr as $ k =>$ v ){ If (is_string ($ v )){ $ Arr [$ k] = addslashes ($ v ); } Else if (is_array ($ v) {// escape if it is an array. $ Arr [$ k] = changes ($ v );   }  } Return $ arr; } Print_r (changes ($ arr )); ?> The input result is as follows: Array ( [0] => a \ "aa [1] => Array         ( [0] => c \ 'd [1] => Array                 ( [0] => e \ "f                 )         ) )

The principle is very simple, that is, to use foreach to traverse the array values.