PHP面向对象~属性

最新推荐文章于 2021-09-02 22:19:13 发布

原创最新推荐文章于 2021-09-02 22:19:13 发布 · 142 阅读

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对属性进行了重写

class employee{
	    protected    $sal=3000;
	    public function getSal(){      
	        return $this->sal;
	    }      
	}
	 
	class Manager extends employee {
	    protected  $sal=5000;
	     
	    public function getParentSal(){
	        return parent::getSal();
	    }  
	}

	$manager = new Manager();
	var_dump($manager);
	echo "PHP ".phpversion()."<br>";
	echo $manager->getSal();
	echo "<br>";
	echo "parent's \$sal ".$manager->getParentSal();

object(Manager)[1]

protected 'sal' => int 5000

PHP 5.6.27
5000
parent's $sal 5000

class employee{
//把protected 变成 private
	    private  $sal=3000;
	    // protected    $sal=3000;
	    public function getSal(){      
	        return $this->sal;
	    }      
	}
	 
	class Manager extends employee {
	    protected  $sal=5000;
	     
	     
	    public function getParentSal(){
	        //这里返回的是父类的private属性.
	        return parent::getSal();
	    }  
	    
	    public function getsa(){
	        echo parent::getSal();
	        return $this->sal;
	    }  
	}

	$manager = new Manager();
	var_dump($manager);
	echo "PHP ".phpversion()."<br>";
	echo $manager->getSal();
	echo "<br>";
	echo "parent's \$sal ".$manager->getParentSal();
echo "<br>";
echo $manager->getsa();

此时对象拥有2个属性，当调用Manager类里面的就用protected类型的sal,调用父类里面的sal就用private.

object(Manager)[1]

protected 'sal' => int 5000

private 'sal' (employee) => int 3000

PHP 5.6.27
3000
parent's $sal 3000
3000

5000