php 中如何用 References 实现 method chain ? - V2EX
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cave
V2EX    PHP

php 中如何用 References 实现 method chain ?

  •  
  •   cave Aug 13, 2012 4673 views
    This topic created in 5008 days ago, the information mentioned may be changed or developed.
    References can produce a chain like what jQuery used:

    <?php
    $a = new test();
    echo ($a -> one() -> two() -> one() -> two() -> one() -> two() -> f);
    ?>

    Result return 29.

    如上 test 是如何用 References 实现的?
    11 replies    1970-01-01 08:00:00 +08:00
    Cofyc
        1
    Cofyc  
       Aug 13, 2012
    public function one() {
    // do stuff

    }
    Cofyc
        2
    Cofyc  
       Aug 13, 2012
    public function one() {
    // do stuff

    }
    Cofyc
        3
    Cofyc  
       Aug 13, 2012
    public function one() {
    // do stuff
    return $this;
    }

    public function two() {
    // do stuff
    return $this;
    }

    // ...

    不知道按了什么按键,连发了两次不完整的。。。
    cave
        4
    cave  
    OP
       Aug 13, 2012
    @Cofyc 可是这样实现跟References有关系吗?

    我以为会是形如:
    class test{
    public $f;

    public function & one(){
    ……
    }

    public function & two(){
    ……
    }
    }
    Cofyc
        5
    Cofyc  
       Aug 13, 2012
    php 里对象变量存储的就是对象的 reference
    不需要 &
    Cofyc
        6
    Cofyc  
       Aug 13, 2012
    jQuery 里写法也是这样的,比如:

    // ...
    ready: function( fn ) {
    // Attach the listeners
    jQuery.bindReady();

    // Add the callback
    readyList.add( fn );

    return this;
    },
    // ...
    yesmeck
        7
    yesmeck  
       Aug 13, 2012
    每个方法都 return $this;
    cave
        8
    cave  
    OP
       Aug 13, 2012
    也就是说 return $this 是间接的使用了References ?

    我以为会有其他的通过References实现method chain的方式

    thanks @Cofyc
    yesmeck
        9
    yesmeck  
       Aug 13, 2012
    @cave 你这个代码是在手册下面的评论里看到的吧。你看那个评论时间,在以前 PHP 的对象不是引用传递的所以没办法直接 return $this; 来实现链式调用。
    cave
        10
    cave  
    OP
       Aug 13, 2012
    @yesmeck
    xcl3721
        11
    xcl3721  
       Aug 28, 2012
    魔法函数+返回自己即可。
    用魔法函数更灵动一些
    http://blog.sina.com.cn/s/blog_4a1695ff0100m1yr.html
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