php - Optional parameters aren't truly optional -

i have real optional parameters in php. realize can this:

function my_function($req_var, $opt_var1 = 90, $opt_var2 = "lala") {     die("weeeeeeee!"); } 

however, if want specify value of $opt_var2, still must specify value $opt_var1.

here's example.

my_function("lala", 90, "omg"); 

in other words, have explicitly write 90 $opt_var1 though it's $opt_var2 want change.

is possible this?

my_function("lala", default, "omg"); 

that helpful.

there way array parameters:

function my_func(array $params = array()){     $arg1 = isset($params['one']) ? $params['one'] : 'default';     $arg2 = isset($params['two']) ? $params['two'] : 'default';     $arg3 = isset($params['three']) ? $params['three'] : 'default';      // ... }