<?phpdate_default_timezone_set("PRC");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 $this->name."'s eating "."'$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 $this->name."'s age is ".($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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