php的面向对象

以下将涵盖php面向对象的主要知识点：

创建classname.php

$name;
    }
    public function __set($name,$value){
        if(($name="attribute") && ($value>=0) && ($valueattribute=$value;
        }

    }
}

//访问修饰符：private、protected、public;
class A{
    public $attribute="default value";
    private function operation1(){
        echo "operation1 called 
";
    }
    protected function operation2(){
        echo "operation2 called 
";
    }
    public function operation3(){
        echo "operation3 called 
";
    }
    function operation(){
        echo "Something 
";
        echo "The value of \$attribute is ". $this->attribute."
";
    }
}

//类的继承、重载
class B extends A{
    public $attribute="different value";
    function __construct(){
        $this->operation2();
        $this->operation3();
    }
    function operation(){
        echo "Something else
";
        echo "The value of \$attribute is ". $this->attribute."
";
    }
}
//使用final关键字禁止继承和重载
class FinalA{
    public $attribute="default value";
    final function operation(){
        echo "Something
";
        echo "The value of \$attribute is".$this->attribute."
";
    }
}
//实现接口
interface Displayable{
    function display();
}
class webPage implements Displayable{
    function display(){
        echo "实现了接口
";
    }
}

//使用Pre-class常量、实现静态方法
class Math{
    //使用Pre-class常量
    const  pi=3.14159;
    //实现静态方法
    static function squared($input){
        return $input*$input;
    }
}

//延迟静态绑定
class C{
    public static function who(){
        echo __CLASS__;
    }
    public static function test(){
        static::who();
    }
}

class D extends C{
    public static function who(){
        echo __CLASS__;
    }
}

//使用抽象类
abstract class E{
    abstract function operationX($param1,$param2);
}

//使用__call()重载方法
class Overload{
    public function __call($method,$p){
        if($method=="display"){
            if(is_object($p[0])){
                $this->displayObject($p[0]);
            }elseif(is_array($p[0])){
                $this->displayArray($p[0]);
            }else{
                $this->displayScalar($p[0]);
            }
        }
    }
}

//实现迭代器和迭代
class myClass{
    public $a="5";
    public $b="7";
    public $c="9";
}

//将类转换成字符串
class Printable{
    public $testone;
    public $testtwo;
    public function __toString(){
        return(var_export($this,TRUE));
    }
}

创建index.php

require_once 'classname.php';
//创建实例
$a=new classname();
$a->attribute=5;


//类的继承、重载
$b=new B();
$b->operation3();
echo "
";
$b->operation();

//访问常量所属的类
echo "Math::pi=".Math::pi."
";
//访问静态方法
echo Math::squared(8)."
";

//检查类的类型和类型提示 instanceof关键字
if($b instanceof B){
    echo "true 
";
}

function check_hint(B $someclass){
    echo "right 
";
}
check_hint($b);

//延迟静态绑定
D::test();
echo "
";
//克隆对象
$c=clone $b;

//使用__call()重载方法
$ov=new Overload();
$ov->display(array(1,2,3));
$ov->display('cat');

//使用__autoload()方法
function __autoload($name){
    include_once $name.".php";
}

//实现迭代器和迭代
$x=new myClass();
foreach($x as $attribute){
    echo $attribute."
";
}

//使用Reflection(反射)API
require_once ("TLA/page.inc");
$class=new ReflectionClass("Page");
echo "
".$class."
";

以上就介绍了php的面向对象，包括了方面的内容，希望对PHP教程有兴趣的朋友有所帮助。