Solution to Disallowed Key Characters prompted by CodeIgniter framework

Open the source code of the ci framework and it is not difficult to find that there is such a function in the core input class of the ci:

Copy codeThe Code is as follows:
Function _ clean_input_keys ($ str)
{
If (! Preg_match ("/^ [a-z0-9: _ \/-] + $/I", $ str ))
{
Exit ('disallowed Key Characters .');
}

// Clean UTF-8 if supported
If (UTF8_ENABLED = TRUE)
{
$ Str = $ this-> uni-> clean_string ($ str );
}

Return $ str;
}
This is for filtering, so an error is thrown.

We can rewrite this method in the application core.
Name MY_Input.php (the prefix MY _ can be customized in config. php) and add the following code.
Copy codeThe Code is as follows:
Class AI_Input extends CI_Input {

// Constructor
Function _ construct (){
Parent: :__ construct ();
}

Function _ clean_input_keys ($ str)
{
If (preg_match ("/^, _ [a-z0-9: _ \/-] + $/", $ str )){
$ Str = preg_replace ("/, _/", "", $ str );
}

If (! Preg_match ("/^ [a-z0-9: _ \/-] + $/I", $ str ))
{
Exit ('disallowed Key Characters. '. $ str );
}
Return $ str;
}
}