访问 SimpleXMLElement 对象的某些属性 [英] Accessing certain properties of a SimpleXMLElement Object

问题描述

当我 print_r() 变量 $xmlObject 引用的 SimpleXMLElement 对象时，我看到以下结构:

When I print_r() the SimpleXMLElement Object referenced by variable $xmlObject, I see the following structure:

SimpleXMLElement Object
(
    [@attributes] => Array
        (
            [uri] => /example
        )

    [result] => SimpleXMLElement Object
        (
            [message] => Record(s) added successfully
            [recorddetail] => Array
                (
                    [0] => SimpleXMLElement Object
                    ...
                )
        )
)

注意 $xmlObject->result->message 属性看起来像一个字符串.但是，如果我执行 print_r($xmlObject->result->message)，我会得到以下结果:

Notice how the $xmlObject->result->message property looks like it is just a string. However, if I do print_r($xmlObject->result->message), I get the following:

SimpleXMLElement Object
(
    [0] => Record(s) added successfully
)

所以在这一点上我很困惑.为什么在这种情况下 $xmlObject->result->message 被标识为 SimpleXMLElement Object 的实例，当打印完整的 $xmlObject 的结果时 不建议这样做吗?

So at this point I'm confused. Why is $xmlObject->result->message being identified as an instance of SimpleXMLElement Object in this case, when the result of printing the full $xmlObject doesn't suggest this?

我如何实际访问这个值?我试过 $xmlObject->result->message[0]，但它只是打印出同样的东西(即我发布的最后一个代码片段).

And how do I actually access this value? I've tried $xmlObject->result->message[0], but it just prints out the same thing (i.e. the last code snippet I posted).

推荐答案

在 SimpleXMLElement 上使用 print_r 或 var_dump 时得到的表示与它的内部结构关系不大.例如，没有您可以使用 $element['@attributes']['uri'] 访问的属性 @attributes.你只要做 $element['uri']

The representation you get when using print_r or var_dump on a SimpleXMLElement has very little to do with how it is structured internally. For instance there is no property @attributes you could access with $element['@attributes']['uri'] either. You just do $element['uri']

事情就是这样.SimpleXmlElement 对象的行为不同.在使用 SimpleXml 之前，请务必阅读 PHP 手册中的示例:

This is simply the way it is. SimpleXmlElement objects behave different. Make sure you read the examples in the PHP Manual before using SimpleXml:

• http://php.net/manual/en/simplexml.examples-基础.php

要详细了解它的实现，您必须查看源代码:

To understand the implementation it in detail, you'd have to look at the source code:

• http://lxr.php.net/opengrok/外部参照/PHP_TRUNK/ext/simplexml/simplexml.c

要打印$xmlObject->result->message，您只需执行echo $xmlObject->result->message.这会将 SimpleXmlElement 自动转换为字符串.

To print $xmlObject->result->message you just do echo $xmlObject->result->message. That will autocast the SimpleXmlElement to string.

这篇关于访问 SimpleXMLElement 对象的某些属性的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！