将__set与数组一起使用已解决，但是为什么呢? [英] Using __set with arrays solved, but why?

问题描述

进行了一些研究，最终我找到了一个我很快将要在这里提出的问题的答案；如何通过PHP中的__get和__set魔术方法使用数组?每当我尝试使用$object->foo['bar'] = 42;之类的值设置值时，它似乎都会默默丢弃它.

Having done a bit of research, I eventually came across the answer to a question I was soon to ask here anyways; How do you work with arrays via the __get and __set magic methods in PHP? Whenever I was trying to set a value using something like $object->foo['bar'] = 42; it seemed to silently discard it.

无论如何，答案很简单； __get方法仅需要通过引用返回.在前面的&"符号之后，确定它可以正常工作.

Anyways, the answer is simple; The __get method simply needs to return by reference. And after tossing an ampersand in front of it, sure enough it works.

我的问题实际上是为什么?我似乎无法理解为什么这行得通. __get通过引用返回如何影响__set处理多维数组?

My question actually, is why? I can't seem to understand why this is working. How does __get returning by reference affect __set working with multidimensional arrays?

顺便说一句，运行PHP 5.3.1

推荐答案

在这种情况下，实际上并未调用__set.如果您将其分解，则应该更有意义:

In this particular case, __set is not actually getting called. If you break down what it happening, it should make a bit more sense:

$tmp = $object->__get('foo');
$tmp['bar'] = 42

如果__get没有返回引用，则不是将42分配给原始对象的'bar'索引，而是将其分配给副本的'bar'索引原始对象.

If __get did not return a reference, then instead of assigning 42 to the 'bar' index of the original object, you're be assigning to the 'bar' index of a copy of the original object.

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