What would you replace ??????? with, below to make the string Hello, World ! be displayed ?

function myfunction(){
    ????????
    print $string;
}

myfunction("Hello, World!");

Options :

1. There is no way to do this.
2. $string = $argv[1];
3. $string = $_ARGV[0];
4. list($string) = func_get_args();
5. $string = get_function_args()

Comments to answer.