Static binding usage Analysis for PHP static delay, static _php tutorial

Static binding usage Analysis for PHP static lazy, static statically

This example describes the static binding usage of PHP static delay. Share to everyone for your reference, as follows:

PHP5.3 later introduced the lazy static binding static, which is to solve what problem? One of the long-running problems with the PHP inheritance model is that it is difficult to refer to the final state of the extended class in the parent class. Take a look at an example.

Class A {public   static function Echoclass () {     echo __class__;   }  public static function test () {     self::echoclass ();      }} Class B extends A {public      static function Echoclass ()   {      echo __class__;   }} B::test (); Output A

A new feature has been added to the PHP5.3: lazy static binding, which is the expression or variable that was fixed at the definition stage, is determined at the execution stage, such as when a subclass inherits the static expression of the parent class, its value cannot be changed, and sometimes it does not want to see it.

The following example solves the problem raised above:

Class A {public   static function Echoclass () {     echo __class__;   }   public static function test ()   {     static::echoclass ();      }} class B extends A {public      static function EC Hoclass () {      echo __class__;   }} B::test (); Output b

The 8th Line of Static::echoclass () defines a static delay binding method until B executes the method that was originally defined when the test was called.

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I hope this article is helpful to you in PHP programming.

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