PHP 方法链还是流利的接口?

2022-01-30 00:00:00 method-chaining oop php fluent-interface

我正在使用 PHP 5，并且听说了面向对象方法中的一个新特性，称为方法链".究竟是什么?如何实现?

I am using PHP 5 and I've heard of a new featured in the object-oriented approach, called 'method chaining'. What is it exactly? How do I implement it?

推荐答案

其实很简单.您有一系列 mutator 方法，它们都返回原始(或其他)对象.这样，您可以继续在返回的对象上调用方法.

It's rather simple, really. You have a series of mutator methods that all return the original (or other) object. That way, you can keep calling methods on the returned object.

<?php
class fakeString
{
    private $str;
    function __construct()
    {
        $this->str = "";
    }
    
    function addA()
    {
        $this->str .= "a";
        return $this;
    }
    
    function addB()
    {
        $this->str .= "b";
        return $this;
    }
    
    function getStr()
    {
        return $this->str;
    }
}


$a = new fakeString();


echo $a->addA()->addB()->getStr();

这会输出ab"

尝试上线啦！

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