Php abstract class usage instance analysis, php abstract instance Analysis _ PHP Tutorial

Php abstract class usage instance analysis, php abstract instance analysis. Php abstract class usage example analysis, php abstract instance analysis this article describes the php abstract class usage. Share it with you for your reference. The details are as follows: php ** abstract * abstract class: * php abstract class usage instance analysis, php abstract instance analysis

This example describes the usage of php abstract classes. Share it with you for your reference. The details are as follows:

<? Php/** abstract * abstract class: * 1. there must be at least one abstract method (no specific implementation method) * 2. it cannot be instantiated, it can be inherited * 3. abstract classes can have subabstract classes * compared with interfaces: * 1. attributes * 2. a subclass can only inherit one abstract class, however, you can implement multiple interfaces ***/abstract class qian {abstract function getfirst (); function gettwo () {echo "I am gettwo ";}} abstract class jj extends qian {abstract function getthree ();} class nan extends jj {function getfirst () {echo "I am getfirst";} function getthree () {echo "I am Getthree ";}}$ nn = new nan (); $ nn-> getfirst (); $ nn-> gettwo (); $ nn-> getthree ();?>

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Examples in this article describes the usage of php abstract classes. Share it with you for your reference. Php/** abstract * abstract class :*...