PHP Delay Binding

1 classproduct{2      Public Static functionCreate () {3         return New Static();4     }5 }6 7 classFoodextendsproduct{8 9 }Ten  One Var_dump(Food::create ()); A //food::out ();

The above code output: Object (food) #1 (0) {}

Class product{public    static function create () {        return to new self ();    }} Class Food extends Product{}var_dump (food::create ());

The above code output: Object (product) #1 (0) {}

A self and static difference, self is the parsing context, not the reference context. In PHP 5.3, the new feature, delay binding, static is similar to self, but it refers to the class being called instead of the containing class.

PHP Delay Binding