How to identify control characters in a url and remove those using php

[Pramod K S]

Hello,

How to identify control characters in a url and remove those using php?

Thanks.

[kovik]

Control characters? Like, ASCII control characters? You could either just use urlencode(), or you could go through the string removing characters with the ASCII value 0 to 31 and 127.

function kill_ctrl_chars($data) {
    $formatted_data = '';
 
    for ($i = 0, $max = strlen($data); $i < $max; $i++) {
        $ascii_value = ord($data[$i]);
 
        if (($ascii_value > 31 || $ascii_value < 0) && $ascii_value != 127) {
            $formatted_data .= $data[$i];
        }
    }
 
    return $formatted_data;
}