codeigniter 2.1.3

Error reported after setting up web hosting: The URI you submitted has disallowed characters

It is said that change $config[‘permitted_uri_chars’] = ‘a-z 0-9~%.:_-‘; to

$config['permitted_uri_chars'] = 'a-z 0-9~%\.\:_\-';

But I didn’t find any effect after I changed it. What works is the following function.

CI_ Just change the URI

function _filter_uri($str)   
{   
if ($str != '' AND $this->config->item('permitted_uri_chars') != '')   
{   
$str = urlencode($str); if ( ! preg_match("|^[".($this->config->item('permitted_uri_chars'))."]+$|i", rawurlencode($str))) {   
exit('The URI you submitted has disallowed characters.');   
}   
$str = urldecode($str);  
}   
return $str;   
}

It seems that this problem has something to do with xampp

The specific reason is not very clear, with time to study