$stmt->bind_param('sssd', $code, $language, $official, $percent);

$stmt->bind_param('sssd', $code, $language, $official, $percent);

function foo(){
    if ( func_num_args() > 0 ){
        var_dump(func_get_args());
    }
}

function bind_param(){
    if ( func_num_args() <= 1 ){
        return false; //not enough args
    }
    $format = func_get_arg(0)
    $args = array_slice(func_get_args(), 1)

    //etc
}

$var->bind()->bindString($code)
            ->bindString($language)
            ->bindString($official)
            ->bindDecimal($percent);

function my_func() {
  $args = func_get_args();
  foreach ($args as $arg) {
    echo "Arg: $argn";
  }
}

function foo()
{
    $numargs = func_num_args();
    echo "Number of arguments: $numargs<br />n";
    if ($numargs >= 2) {
        echo "Second argument is: " . func_get_arg(1) . "<br />n";
    }
    $arg_list = func_get_args();
    for ($i = 0; $i < $numargs; $i++) {
        echo "Argument $i is: " . $arg_list[$i] . "<br />n";
    }
}

foo(1, 2, 3);