Instantiation, the constructor php class knowledge drip --- class, inheritance preliminary

• Instantiate the class ---- Black & usage, by string to instantiate

class Coach 
{ 
    public function the __construct () 
    { 
        echo " Welcome North Wu Tang " . " \ n- " ; 
    } 
    public function Slogan () 
    { 
        echo " Houhou ~ ha ~ " . " \ n- " ; 
    } 
} 
$ wenwa = ' coach ' ; // string corresponding to the coach class 
$ Duwa = new new $ wenwa; 
$ Duwa -> Slogan ();

 

• Constructor

? < PHP
 class mylove 
{ 
    public $ name = " Chen Peichang " ;
     public function __construct () 
    { 
        echo " like to practice fighting brother " . " \ The n- " ; 
    } 
    public function showmyname () 
    { 
        echo " acquired the name: " . $ the this . -> name " \ n- " ; 
    } 
} 
$ CPC = new new mylove (); 
$ CPC -> showmyname ();
?> 

Result:

　　I like to practice fighting brother
　　acquired the name: Chen Peichang

•  Inheritance (with different python, php is a single inheritance language, that is, a class can have only one parent)

 

Parent code as follows:
 class Coach 
{ 
    public $ = Master " Zhang " ;
     protected $ = Lover " D cauldron " ;
     Private $ LoveGame = " SM " ;
     public function Slogan () 
    { 
        echo " Houhou ~ ~ ha " . " \ n- " ; 
    } 
}

定义父类coach的子类cpc，继承使用关键词extends
class cpc extends coach
{
    public function __construct()
    {
        //$this->master = $master;
        echo "我的师父是".$this->master."__我爱".$this->lover."__喜欢玩"."\n";
    }

    public function self_introduce($name,$age)
    {

        echo "hello~my name is ".$name."今年芳龄".$age."\n";
    }
}
$cpc = new cpc();

$cpc->slogan();

输出结果：

吼吼~哈哈~
hello~my name is 陈培昌今年芳龄21

点评：哇啊哦~这么厉害，子类cpc里没有定义slogan方法居然可以调用！正是继承的魔力之所在！