Question

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Closed 11 years ago.

I m new to PHP OOP, and I think public $var and __construct() are exactly the same. What s the difference? Which one should I use?

Answer 1

它们是completely不同事物:一是宣布某一类财产,另一是该类建筑商的名称。

这里不存在“一人或另一人”。

我建议在你的PHP书或手册中重新阅读所有网站。

Answer 2

public $var is not a constructor, which __construct() is. I hope you meant something else.

如 manual所述,有两种构造:

class Bar {
    public function Bar() {
        // "old" style constructor
    }
}

class Foo {
   function __construct() {
       // new style constructor
   }
}

Answer 3

public $var;

Declares a variable that will be accessible to the outside world.

function __construct () { /* Do stuff */ }

界定“魔法”构造方法。采用这一方法时,将采用新方法(即当你创建<条码>新/代码>时)。这种方法接受和处理在制造新物体时通过的任何论点。

主要的区别是,一种定义是变数(财产),一种界定功能(方法)。

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