php物件導向之類成員 深入php物件導向 php是物件導向的嗎 php 物件導向 多

類的成員：
1.常數 ： const 常數名稱 = 值;

2.屬性
2.1 靜態屬性
2.2 實例屬性

3.方法
3.1靜態方法
3.2實例方法
3.3構造方法
3.4析構方法

注意：
①靜態屬性是屬於類別的，透過這個類別建立的物件共用此屬性
②實例方法中可以使用靜態屬性和靜態方法
③靜態方法中不可以存取實例屬性和實例方法，因為靜態的都是屬於類別的，實例的屬於對象，類別在的時候對象還沒new出來！

<code><span><span><?php</span>header(<span>"content-type:text/html;charset=utf-8"</span>);

<span><span>class</span><span>C</span>{</span><span>const</span> PATH = <span>"C:/windows"</span>;<span>//类中不能使用 define定义常量</span><span>//静态属性</span><span>static</span><span>$count</span>  = <span>66</span>;<span>//等价于 static public $count = 66;</span><span>//实例属性</span><span>public</span><span>$name</span> = <span>"tom"</span>;<span>//等价于 var $name = "tom";</span><span>//默认的无参构造函数</span><span>//function __construct(){</span><span>//</span><span>//  echo "<br> __construct  无参构造方法被调用";</span><span>//}</span><span>//有参构造函数，一般用来类成员属性的初始化，php中一个类只能存在一个构造方法</span><span><span>function</span><span>__construct</span><span>(<span>$name</span>)</span>{</span><span>$this</span>->name = <span>$name</span>;
  <span>echo</span><span>"<br> __construct  有参构造方法被调用"</span>;
}

<span>//实例方法</span><span><span>function</span><span>instanceFun</span><span>()</span>{</span><span>echo</span><span>"<br>实例方法被调用"</span>;
  <span>echo</span><span>"<br>实例方法中访问常量:"</span>.<span>self</span>::PATH;
  <span>echo</span><span>"<br>实例方法中访问实例属性：{$this->name}"</span>;
  <span>echo</span><span>"<br>实例方法中访问静态属性："</span>.<span>self</span>::<span>$count</span>;<span>//self就代表类本身</span><span>//实例方法中调用静态方法</span><span>self</span>::staticFun();

}

<span>//静态方法</span><span>static</span><span><span>function</span><span>staticFun</span><span>()</span>{</span><span>echo</span><span>"<br>静态方法被调用"</span>;
  <span>echo</span><span>"<br>静态方法中访问常量:"</span>.<span>self</span>::PATH;
  <span>echo</span><span>"<br>静态方法中访问静态属性："</span>.<span>self</span>::<span>$count</span>;
  <span>//注意：静态方法中无法访问实例属性</span>}

<span>//析构方法，当对象被销毁的时候由系统去调用</span><span>//通常代码执行完，对象就会被销毁</span><span><span>function</span><span>__destruct</span><span>()</span>{</span><span>echo</span><span>"<br>对象 {$this->name} 被销毁"</span>;
}


}


<span>$object</span> = <span>new</span> C(<span>"哈利波特"</span>);
<span>$object</span>->instanceFun();
<span>echo</span><span>"<hr>"</span>;
C::staticFun();

<span>//下面代码会使$object指向的对象被销毁</span><span>//$object = null;</span><span>//$object = new C("秦始皇");;</span><span>//$object = 3;</span><span>//unset($object);</span><span>echo</span><span>"<br>程序最后一行代码。。。"</span>;</span></code>

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