Advanced Features of PHP

1) Late Static Binding:
“Late binding” comes from the fact that static:: will not be resolved using the class where the method is defined but it will rather be computed using runtime information.

class A {
    public static function who() {
        echo __CLASS__;
    }
    public static function test() {
        self::who();
    }
}

class B extends A {
    public static function who() {
        echo __CLASS__;
    }
}

B::test();

Instead of “self::who()” replace with “static::who()”. Then the output will be “B” instead of “A”.

2) Variable Length Argument Lists :

func_num_args() ==> returns number of arguments passed
func_get_arg(int) ==> returns the nth argument passed in
func_get_args() ==> returns an array of all arguments