php SimpleXML属性丢失 [英] php SimpleXML attributes are missing

问题描述

我在这里有以下xml文档: (请参阅下面的示例)

I have the following xml document here: (see below for sample)

我正在使用php/SimpleXML将其隐藏为对象以读取它:

I am using php/SimpleXML to covert it to an object to read it:

$xmlContent = file_get_contents($path . '/test.xml');
$tablesRaw = new SimpleXMLElement($xmlContent);
echo '<pre>';
print_r($tablesRaw);
echo '</pre>';

当我print_r时，我看到字段的属性，但是不显示可接受值的属性.这是原始xml的示例(我需要value属性):

When I print_r I see attributes for field but attributes for acceptable-value do not show. Here is an example of the raw xml (I need the value attribute):

<acceptable-value value="0">
    Unknown
</acceptable-value>

这是我在print_r时看到的:

This is what I see when I print_r:

[acceptable-values] => SimpleXMLElement Object
                                            (
                                                [acceptable-value] => Array
                                                    (
                                                        [0] => 
                    Unknown

                                                        [1] => 
                    Invalid

                                                        [2] => 
                    Deleted

                                                        [3] => 
                    Valid/Good

                                                        [4] => 
                    Inactive

                                                    )

                                            )

任何提示为何未显示属性?预先感谢.

Any clues why the attributes are not showing? Thanks in advance.

请求一些xml:

<field name="Address1Type" type="String"/>
<field name="Address2Street1" type="String"/>
<field name="Address2Street2" type="String"/>
<field name="Address2Type" type="String"/>
<field name="Address3Street1" type="String"/> 
<field name="Status" type="Integer" access="R">
            <acceptable-values>
                <acceptable-value value="0">
                    Unknown
                </acceptable-value>
                <acceptable-value value="1">
                    Invalid
                </acceptable-value>
                <acceptable-value value="2">
                    Deleted
                </acceptable-value>
                <acceptable-value value="3">
                    Valid/Good
                </acceptable-value>
                <acceptable-value value="4">
                    Inactive
                </acceptable-value>
            </acceptable-values>
        </field>

推荐答案

这里的简单答案是不要将print_r()与SimpleXML对象一起使用.因为它们是非PHP数据的包装，所以通常会显示整个"对象的函数并不能真正反映出您正在查看的内容.

The simple answer here is not to use print_r() with SimpleXML objects. Because they are wrappers around non-PHP data, functions like that which would normally show the "whole" object don't really reflect what you're looking at.

使用SimpleXML访问属性的方法是使用属性名称，就像它是数组键($node['attribute'])一样；这不是不是，意味着在某个地方有一个带有该键的数组，这是伪装的函数调用.

The way to access an attribute with SimpleXML is to use the attribute name as though it was an array key ($node['attribute']); this does not mean that there is an array somewhere with that key, it is a function-call in disguise.

如果您想在编写SimpleXML代码时了解正在查看的节点，请查看此<我写的c2>函数(欢迎反馈).

If you want to get a feel for which nodes you're looking at while writing SimpleXML code, check out this simplexml_dump() function which I wrote (feedback welcome).

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