Difference in behaviour of func_num_args,func_get_arg and func_get_args from php 5.2 to 5.3

Question

I have seen the PHP manual. But I don\'t understand the difference in behaviour between the earlier version and the later versions of PHP. I don\'t understand this statement

Answer 1

It means that this is invalid in 5.2:

function foo() {
    $array = array_map('strtolower', func_get_args());
}
foo('BAR', 'BAZ');

It will abort with a Fatal error:

PHP Fatal error: func_get_args(): Can't be used as a function parameter

However in 5.3, it is valid code.