php 简单 xml 元素问题/bug
我有一些 xml，可以说
当我运行以下命令时：
$simpleXMLElement = new SimpleXMLElement($xml);
pr($simpleXMLElement);
我得到以下内容：
SimpleXMLElement Object
(
[@attributes] => Array
(
[number] => 12
)
[0] =>
)
它抛出 0 条目。这很奇怪。我不知道它应该代表什么。如果我这样做：
<names number="12"><name first="oliver" /></names>
我会得到以下输出：
SimpleXMLElement Object
(
[@attributes] => Array
(
[number] => 12
)
[name] => SimpleXMLElement Object
(
[@attributes] => Array
(
[first] => oliver
)
)
)
这是预期的（至少对我来说）。有什么想法/方向吗？
I have some xml, lets say <names number="12"></names>
When I run the following:
$simpleXMLElement = new SimpleXMLElement($xml);
pr($simpleXMLElement);
I get the following:
SimpleXMLElement Object
(
[@attributes] => Array
(
[number] => 12
)
[0] =>
)
It throws in that 0 entry. This is weird. I don't know what it's supposed to represent. If I do this instead:
<names number="12"><name first="oliver" /></names>
I get the following output:
SimpleXMLElement Object
(
[@attributes] => Array
(
[number] => 12
)
[name] => SimpleXMLElement Object
(
[@attributes] => Array
(
[first] => oliver
)
)
)
This is as expected (for me at least). Any thoughts/direction?
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评论（2）
首先：如果您的帖子格式不正确，则不会显示 XML。任何代码缩进至少 4 个空格。
其次，不要期望
print_r()或var_dump()为您提供SimpleXMLElement的精确表示，因为 SimpleXML 使用了很多魔法，所以子项和属性不一定会出现在输出中。First: if you don't correctly format your post, the XML will not be displayed. Indent any code with at least 4 spaces.
Secondly, do not expect
print_r()orvar_dump()to give you an exact representation of aSimpleXMLElementbecause SimpleXML uses lots of magic, so children and attributes won't necessarily show up in the output.这似乎只是 SimpleXML 做了一个快速而肮脏的解析元素的工作：因为你有
names标记内找不到任何元素时，它会留下一个空数组，其中包含键0，因为它不知道名称是什么给它。短标签 (
It seems to be just SimpleXML doing a quick-and-dirty job of parsing the element: Since you have
<names></names>, it adds an array inside the element, as expecting elements within it, and when it doesn't find any elements inside thenamestags, it leaves an empty array, with the key0, since it doesn't know what name to give it.A short tag (
<names />) shouldn't generate the empty content. (As weird as that sounds.)