PHP 从对象打印键？
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PHP Print keys from an object?
提问by user723220
I have an object BIRD and then there is [0] through [10] and each number has a subheading like "bug" or "beetle" or "gnat" and a value for each of those.
我有一个对象 BIRD，然后有 [0] 到 [10]，每个数字都有一个副标题，如“bug”或“甲虫”或“gnat”，以及每个数字的值。
I want to print
我要打印
BIRD
[0]
bug = > value
I can't find out how to do this anywhere - there is talk of PUBLIC and PRIVATE and CLASS and that's where I fall off
我无法在任何地方找到如何做到这一点 - 有关于 PUBLIC、PRIVATE 和 CLASS 的讨论，这就是我失败的地方
采纳答案by Cloudson
I could be wrong but try to use array_keysusing a object as parameter. I believe that is possible in php.
http://php.net/manual/en/function.array-keys.php
我可能是错的，但尝试使用array_keys对象作为参数。我相信这在 php 中是可能的。
http://php.net/manual/en/function.array-keys.php
Anyway, read about reflection.
无论如何，请阅读反射。
回答by brenjt
You could easily do it by type casting the object:
您可以通过对对象进行类型转换来轻松完成：
$keys = array_keys((array)$BIRD);
$keys = array_keys((array)$BIRD);
回答by nick
Similar to brenjt's response, this uses PHP's get_object_varsinstead of type casting the object.
与 brenjt 的响应类似，它使用 PHP 的get_object_vars而不是类型转换对象。
$array = get_object_vars($object);
$properties = array_keys($array);
回答by Bart B
If the 'object' is actually an associative array rather than a true object then array_keys()will give you what you need without warnings or errors.
如果“对象”实际上是一个关联数组而不是真正的对象，那么array_keys()它将为您提供所需的内容，而不会出现警告或错误。
On the other hand, if your object is a true object, then you will get a warning if you try use array_keys()directly.
另一方面，如果您的对象是真正的对象，那么如果您尝试array_keys()直接使用，则会收到警告。
You can extract the key-value pairs from an object as an associative array with get_object_vars(), you can then get the keys from this with array_keys():
您可以使用 将对象中的键值对提取为关联数组get_object_vars()，然后您可以使用 从中获取键array_keys()：
$keysFromObject = array_keys(get_object_vars($anObject));
