<?php
class classname{
  var $attr1;
  var $attr2;
  public $attribute;
  const PI = 3.14;
  // 構(gòu)造函數(shù)
  function __construct($param = 'default'){
    echo "Constructor called with parameter $param<br />";
  }
  // 析構(gòu)函數(shù)
  function __destruct(){
    echo '<br />destruct';
  }
  //
  function oper1(){
    echo 'oper1<br />';
  }
  function oper2($param){
    $this->attr1 = $param;
    echo $this->attr1;
  }
  protected function oper3(){
    echo 'this is protected function<br />';
  }
  // 禁止繼承
  final function oper5(){
  }
  function __get($name){
    return $this->$name;
  }
  function __set($name, $value){
    $this->$name = $value;
  }
  // 靜態(tài)方法
  static function double($param){
    return $param * $param;
  }
}
$a = new classname('First');
$b = new classname('Second');
$c = new classname();
$c->oper2("hello");
echo '<br />';
echo $c->attr1;
echo '<br /><br />';
echo ' Per-Class常量 classname::PI -'.classname::PI;
echo '<br />靜態(tài)方法: classname::double(3) - ' . classname::double(3);
echo '<br />';
// 實(shí)現(xiàn)繼承
echo '實(shí)現(xiàn)繼承<br />';
class B extends classname{
  function oper4(){
    $this->oper3(); // protected方法只能在
  }
  function oper1(){ // 重載
    echo 'this is class B /'s oper1. <br />';
  }
}
$d = new B("forth");
$d->oper1();
$d->oper4();
// 接口
interface Displayable
{
  function display();
  function show();
}
class C implements Displayable
{
  function display(){
    echo '這是對應(yīng)接口的方法.<br />';
  }
  function show(){}
}
$e = new C();
$e->display();
echo '檢查$e是否為C的實(shí)例:';
echo ($e instanceof C) ? 'Yes':'No';
// 克隆對象
$f = clone $e;
echo '<br /><br />可以使用__clone()方法，在使用clone關(guān)鍵字時調(diào)用';
// 抽象類
abstract class E{}
// $f = new E(); // 這行將報(bào)錯,不能實(shí)例化抽象類
//　參數(shù)重載，多態(tài)
class F{
  public $a = 1;
  public $b = 2;
  public $c = 3;
  function displayString($elem){
    echo '<br />string:'.$elem;
  }
  function displayInt($elem){
    echo '<br />int:'.$elem;
  }
  // 注意參數(shù)$p，是作為數(shù)組傳入，必須使用下標(biāo)訪問
  function __call($method, $p){
    if ($method == 'display'){
      if (is_string($p[0])){
        $this->displayString($p[0]);
      } else {
        $this->displayInt($p[0]);
      }
    }
  }
}
$g = new F();
$g->display('abc');
// 迭代器,讀出實(shí)例的所有屬性
foreach ($g as $att){
  echo '<br />'.$att;
}
// 反射
echo '<br />';
$class = new ReflectionClass('F');
echo '<pre>';
echo $class;
echo '</pre>';
?>