如何在php中访问名为变量(点表示法)的深层对象属性? [英] How can I access a deep object property named as a variable (dot notation) in php?

问题描述

有许多与此类似的问题，但是这有点不同，因为它涉及的是深层对象属性访问，而不仅仅是深度的一个级别.

There are many questions similar to this, however this is slightly different since it's about deep object property access, not just one level of depth.

假设我有一个包含字符串foo.bar的变量.

Let's say I have a variable containing the string foo.bar.

$user = new User();
$user->foo = new Foo();
$user->foo->bar = "Hello World";

$variable = "foo.bar"

我想通过使用$variable回显$user->foo->bar:

echo $user->foo->bar

这是我到目前为止尝试过的但没有成功的内容(显示为 NULL ):

This is what I have tried so far but with no success (it says NULL):

$value = str_replace(".", "->", $value);
echo $user->{$value};

推荐答案

使用可变属性符号($o->$p)减少对象路径非常容易:

It is very easy to reduce the object path using variable property notation ($o->$p):

$path = 'foo.bar';
echo array_reduce(explode('.', $path), function ($o, $p) { return $o->$p; }, $user);

可以很容易地将其转换成一个小的辅助函数.

This could easily be turned into a small helper function.

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