如何在PHP5中构建多oop函数 [英] How to build multi oop functions in PHP5

问题描述

我对PHP5中的OOP有疑问.我看到越来越多的代码是这样写的:

I have a question about OOP in PHP5. I have seen more and more code written like this:

$object->function()->first(array('str','str','str'))->second(array(1,2,3,4,5));

但是我不知道如何创建这种方法.希望有人可以在这里为我提供帮助，:0)非常感谢.

But I don't know how to create this method. I hope somebody can help me here, :0) thanks a lot.

推荐答案

在您自己的类中链接方法的关键是返回一个对象(几乎总是$this)，然后将该对象用作该对象的对象.下一个方法调用.

The key to chaining methods like that within your own classes is to return an object (almost always $this), which then gets used as the object for the next method call.

像这样:

class example
{
    public function a_function()
    {
         return $this;
    }

    public function first($some_array)
    {
         // do some stuff with $some_array, then...
         return $this;
    }
    public function second($some_other_array)
    {
         // do some stuff
         return $this;
    }
}

$obj = new example();
$obj->a_function()->first(array('str', 'str', 'str'))->second(array(1, 2, 3, 4, 5));

注意，有可能返回除$this之外的对象，并且上面的链接内容实际上只是说$a = $obj->first(...); $b = $a->second(...);的一种较短方法，它消除了调用后不再使用的设置变量的丑陋性.

Note, it's possible to return an object other than $this, and the chaining stuff above is really just a shorter way to say $a = $obj->first(...); $b = $a->second(...);, minus the ugliness of setting variables you'll never use again after the call.

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