Question

Hi StackOverflow Community,

Here is my question, how to convert php that has hex code into readable string ?
On what I mean is all inside this 2 php code..

<?php

echo "\x74\150\x69\163\x20\151\x73\40\x74\145\x73\164\x69\156\x67\40\x6f\156\x6c\171";

echo test['\x74\171\x70\145'];

echo range("\x61","\x7a");

?>

this is un-readable code, I need some php function that can convert those unreadable code into readable code..so it will become like this after convert..

<?php

echo "this is testing only";

echo test['type'];

echo range("a","z");

?>

I know i can just echo that hex to change it to readable string, but I have huge php file and lot’s of php file that same like this, so I need php function that can automatically convert them all into readable code.

Thank..

Answer 1

It seems your code is obfuscated not only with hex escape sequences, but with octal as well. I’ve written this function to decode it for you:

function decode_code($code){
    return preg_replace_callback(
        "@\\\(x)?([0-9a-f]{2,3})@",
        function($m){
            return chr($m[1]?hexdec($m[2]):octdec($m[2]));
        },
        $code
    );
}

See it in action here: http://codepad.viper-7.com/NjiL84