Late static binding of PHP

This article mainly introduces the late static binding of PHP, has a certain reference value, now share to everyone, the need for friends can refer to

PHP 5.3.0, PHP added a function called late static binding, used to refer to statically invoked classes within the scope of the inheritance, this is the official PHP explanation, that is, in the class inheritance process, the class is no longer the current class, but the call class.

Later static bindings are implemented using the keyword static, which, through this mechanism, "static:" is not parsed to define the class in which the current method is located, but is computed at the actual run time, the class originally called at runtime.

Although it is called a late static binding, it is not limited to the invocation of static methods.

Class a{public    static function call () {        echo "class a<br/>";    }    public static function test () {        self::call ();        Static::call ();    }} Class B extends a{public    static function call () {        echo "Class B";    }} Echo (B::test ());//output result://class a//class B

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