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Homephp教程php手册ThinkPHP中__initialize()和类的构造函数__construct()用法分析,thinkphp构造函数

ThinkPHP中__initialize()和类的构造函数__construct()用法分析,thinkphp构造函数

本文实例分析了ThinkPHP中的__initialize()和类的构造函数__construct()。分享给大家供大家参考。具体分析如下:

thinkphp中的__construct是不可以随便用的,因为你的模块类继承上级类,上级类有定义好的;

1、__initialize()不是php类中的函数,php类的构造函数只有__construct().

2、类的初始化:子类如果有自己的构造函数(__construct()),则调用自己的进行初始化,如果没有,则调用父类的构造函数进行自己的初始化。

3、当子类和父类都有__construct()函数的时候,如果要在初始化子类的时候同时调用父类的__constrcut(),则可以在子类中使用parent::__construct().

如果我们写两个类,如下:

复制代码 代码如下:

class Action{ 
    public function __construct() 
    { 
        echo 'hello Action'; 
    } 

class IndexAction extends Action{ 
    public function __construct() 
    { 
        echo 'hello IndexAction'; 
    } 

$test = new IndexAction; 
//output --- hello IndexAction


很明显初始化子类IndexAction的时候会调用自己的构造器,所以输出是'hello IndexAction',但是将子类修改为:

复制代码 代码如下:

class IndexAction extends Action{ 
    public function __initialize() 
    { 
        echo 'hello IndexAction'; 
    } 
}


那么输出的是'hello Action',因为子类IndexAction没有自己的构造器,如果我想在初始化子类的时候,同时调用父类的构造器呢?

复制代码 代码如下:

class IndexAction extends Action{ 
    public function __construct() 
    { 
        parent::__construct(); 
        echo 'hello IndexAction'; 
    } 
}


这样就可以将两句话同时输出,当然还有一种办法就是在父类中调用子类的方法.

复制代码 代码如下:

class Action{ 
    public function __construct() 
    { 
        if(method_exists($this,'hello')) 
        { 
            $this -> hello(); 
        } 
        echo 'hello Action'; 
    } 

class IndexAction extends Action{ 
    public function hello() 
    { 
        echo 'hello IndexAction'; 
    } 
}


这样也可以将两句话同时输出,而这里子类中的方法hello()就类似于ThinkPHP中__initialize()。

所以,ThinkPHP中的__initialize()的出现只是方便程序员在写子类的时候避免频繁的使用parent::__construct(),同时正确的调用框架内父类的构造器,所以,我们在ThnikPHP中初始化子类的时候要用__initialize(),而不用__construct(),当然你也可以通过修改框架将__initialize()函数修改为你喜欢的函数名.

希望本文所述对大家的ThinkPHP框架程序设计有所帮助。

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