PHP sharing about object-oriented programming examples

<?php/**
 * PHP面向对象编程简单实例
 */date_default_timezone_set("PRC");/*

* 1.静态属性用于保存类的公有数据

* 2.静态方法里面只能访问静态属性

* 3.静态成员不需要实例化对象就可以进行访问

* 4.类的内部可以通过self或者static关键字访问自身静态成员

* 5.可以通过parent关键字访问父类的静态成员

* 6.可以通过类的名称在类定义外部访问静态成员

*

*/class Human{    public $name;    protected $height; //只有自身和子类可以访问    public $weight;    private $isHungry = true; //不能被子类访问    public static $sValue = "Static value in Human class"."\n";    public function eat($food){        echo $this->name."&#39;s eating "."&#39;$food"."\n";

    }    public function info(){        echo "HUMAN :".$this->name. ";".$this->height.";".$this->isHungry."\n";

    }

}class Animal{

}//类的定义以关键字class开始,后面是类的名称，类的命名通常第一个字母大写，以中括号开始和结束//在PHP中用extends关键字表示类的继承，后面跟父类的类名//PHP中extends后只能跟一个类的类名，这是PHP中的单继承原则class NBaplayer extends Human{// public $name = "Jordan"; //定义属性// public $height = "198cm";// public $weight = "98kg";    public $team = "Bull";    public $playernumber = "23";    private $age = "40"; //Private的类成员只能在内部被访问//静态属性在定义时在访问控制关键字后面添加static关键字即可    public static $president = "David Stern";// 静态方法在定义时在访问控制关键字后面添加static关键字即可    public static function changePresident($newpresdt){//在类定义中使用静态成员时，用self或者static关键字后面跟::操作符即可//注意，在访问静态成员属性时，::后面需要跟$符号        self ::$president = $newpresdt;//使用parent关键字访问父类中的静态成员        echo parent::$sValue."\n";

    }//构造函数，在对象被实例化时自动调用    function __construct($name,$height,$weight,$team,$playernumber)    {        echo "in NBaplayer constuctor\n";        $this->name = $name; //$this是php里面的伪变量，表示对象自身，可以通过$->this的方式访问对象的属性和方法        $this->height = $height;        $this->weight = $weight;        $this->team = $team;        $this->playernumber = $playernumber;        echo $this->height."\n";

    }//析构函数，在程序执行结束时自动调用//析构函数通常被用于清理程序使用的资源。比如，程序使用了打印机，那么可以在析构函数里释放打印机资源    function __destruct()    {        echo "Destroying ".$this->name."\n";

    }//定义方法    public function run()    {        echo "running\n";

    }    public function jump()    {        echo "jumping\n";

    }    public function dribble()    {        echo "dribbling\n";

    }    public function shoot()    {        echo "shooting\n";

    }    public function dunk()    {        echo "dunking\n";

    }    public function pass()    {        echo "passing\n";

    }    public function getAge(){        echo $this->name."&#39;s age is ".($this->age - 2)."\n";

    }

}//类到对象的实例化//类的对象为实例化时使用关键字new,后面是类的名称和一堆括号//$jordan = new NBaplayer("Jordan","198cm","98kg","Bull","23");//$james = new NBaplayer("James","203cm","120kg","Heat","6");//对象中的成员属性通过->符号来访问//在类定义外部访问静态属性，可以用类名加::操作符的方法来访问类的静态成员//echo NBaplayer::$president." Before change"."\n";//NBaplayer::changePresident("Aadam Siver");//echo NBaplayer::$president."\n";//echo Human::$sValue."\n";//echo "Jordan : ".$jordan->president."\n";// echo "James : ".$james->president."\n";//echo $jordan->name."\n";//echo $jordan->getAge();//$jordan->info();//$jordan->eat("Apple"); //在子类中的对象上可以直接访问父类中定义的属性和方法//对象中的成员方法通过->符号来访问//$jordan->dribble();//$jordan->dunk();// $jordan->jump();// $jordan->pass();// $jordan->run();// $jordan->shoot();//// //每一次用new实例化对象的时候，都会用类名后面的参数列表调用构造函数//$james = new NBaplayer("James","203cm","120kg","Heat","6");//echo $james->name."\n";// //通过把变量设置为Null,可以出发析构函数的调用// //当对象不会再被使用的时候,会触发析构函数//$james1 = $james;//$james2 = &$james;//$james2 = null;//$james1 = null;// echo "From now on James will not be used.\n";

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