Implementation code of php enhanced mhash function

The encryption function mhash of PHP is used in the program, and the error is reported: Fatal error: Call to undefined function mhash()

Two solutions are provided below for reference. 1. Import the php_mhash.dll extension file, and in addition, import libmhash.dll (the loading of the mhash library depends on this file), Load LoadFile C:/php/libmhash.dll in Apache’s configuration file Httpd.conf”.

2. Use custom mhash enhancement function.

 $b)
    {
        $key = pack('H*', md5($key));
    }
    $key  = str_pad($key, $b, chr(0x00));
    $ipad = str_pad('', $b, chr(0x36));
    $opad = str_pad('', $b, chr(0x5c));

    $k_ipad = $key ^ $ipad;
    $k_opad = $key ^ $opad;

    return md5($k_opad . pack('H*', md5($k_ipad . $data)));
}
?>

Code description: The parameters $key and $data in the hmac_md5 function correspond to the original 3,2 parameters of mhash. Both methods can successfully use PHP's mhash encryption function.