How to pass array as multiple parameters to function?

As of PHP 5.6 you can use argument unpacking:

function add($a, $b, $c) {
    return $a + $b + $c;
}

$numbers = [1, 2, 3];
echo add(...$numbers);

You need to use call_user_func_array

call_user_func_array( array($method, $function), $params);