php 为什么 SimpleXMLElement 返回一个空对象？
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Why does SimpleXMLElement returns a empty object?
提问by Italo André
I am using the SimpleXMLElement method to load a string, but it just does not work. My code is:
我正在使用 SimpleXMLElement 方法加载字符串，但它不起作用。我的代码是：
$xml = new SimpleXMLElement($content);
var_dump($xml);
And the var_dump returns
并且 var_dump 返回
object(SimpleXMLElement)#104 (0) { }
The var $content is correctedly setted and filled, if I echo this var, this is the result:
var $content 已正确设置和填充，如果我回应此 var，结果如下：
<?xml version="1.0" encoding="utf-8" ?>
<string xmlns="http://www.jadlog.com.br/JadlogWebService/services">
<Jadlog_Tracking_Consultar>
<ND>
<Numero>10080780714284</Numero>
<Status>ENTREGUE</Status>
<DataHoraEntrega>16/06/2011</DataHoraEntrega>
<Recebedor>DIEGO OLIVEIRA CRUZ</Recebedor>
<Documento>0883473380</Documento>
<Evento>
<Codigo></Codigo>
<DataHoraEvento>10/06/2011 19:51</DataHoraEvento>
<Descricao>EMISSAO </Descricao>
<Observacao>CO SAO PAULO 08</Observacao>
</Evento>
<Evento>
<Codigo></Codigo>
<DataHoraEvento>10/06/2011 20:12</DataHoraEvento>
<Descricao>TRANSFERENCIA </Descricao>
<Observacao>TECA JAD SAO</Observacao>
</Evento>
<Evento>
<Codigo></Codigo>
<DataHoraEvento>10/06/2011 20:53</DataHoraEvento>
<Descricao>ENTRADA </Descricao>
<Observacao>TECA JAD SAO</Observacao>
</Evento>
<Evento>
<Codigo></Codigo>
<DataHoraEvento>10/06/2011 21:05</DataHoraEvento>
<Descricao>TRANSFERENCIA </Descricao>
<Observacao>FL JAD SALVADOR</Observacao>
</Evento>
<Evento>
<Codigo></Codigo>
<DataHoraEvento>12/06/2011 10:27</DataHoraEvento>
<Descricao>ENTRADA </Descricao>
<Observacao>FL JAD SALVADOR</Observacao>
</Evento>
<Evento>
<Codigo></Codigo>
<DataHoraEvento>12/06/2011 11:21</DataHoraEvento>
<Descricao>TRANSFERENCIA </Descricao>
<Observacao>CO SALVADOR 02</Observacao>
</Evento>
<Evento>
<Codigo></Codigo>
<DataHoraEvento>12/06/2011 11:25</DataHoraEvento>
<Descricao> ATRASO TRANSPORTE</Descricao>
<Observacao>FL JAD SALVADOR</Observacao>
</Evento>
<Evento>
<Codigo></Codigo>
<DataHoraEvento>12/06/2011 11:51</DataHoraEvento>
<Descricao>TRANSFERENCIA </Descricao>
<Observacao>CO SALVADOR 02</Observacao>
</Evento>
<Evento>
<Codigo></Codigo>
<DataHoraEvento>14/06/2011 14:28</DataHoraEvento>
<Descricao>ENTRADA </Descricao>
<Observacao>CO SALVADOR 02</Observacao>
</Evento>
<Evento>
<Codigo></Codigo>
<DataHoraEvento>14/06/2011 16:14</DataHoraEvento>
<Descricao>ENTRADA </Descricao>
<Observacao>CO SALVADOR 02</Observacao>
</Evento>
<Evento>
<Codigo></Codigo>
<DataHoraEvento>14/06/2011 18:10</DataHoraEvento>
<Descricao>EM ROTA </Descricao>
<Observacao>CO SALVADOR 02</Observacao>
</Evento>
<Evento>
<Codigo></Codigo>
<DataHoraEvento>16/06/2011 08:59</DataHoraEvento>
<Descricao>ENTREGUE </Descricao>
<Observacao>CO SALVADOR 02</Observacao>
</Evento>
</ND>
</Jadlog_Tracking_Consultar>
</string>
Could someone help me out with this?
有人可以帮我解决这个问题吗？
采纳答案by Italo André
The problem was with the webservice, it was returning a Soap Object, but I was able to see it just in the source-code. As the XML was showing ok, I wasn't thinking there was a problem with the request. After checking the source-code and using Soap to handle the requests, I could figure it out. SimpleXML works nice.
问题出在网络服务上，它返回一个 Soap 对象，但我只能在源代码中看到它。由于 XML 显示正常，我认为请求没有问题。检查源代码并使用 Soap 处理请求后，我可以弄清楚。SimpleXML 工作得很好。
Thanks to everyone for the help.
感谢大家的帮助。
回答by Ross
It may not be 'empty' - try $xml->children();for example. As far as I know SimpleXmlElement doesn't behave like other PHP objects, in that when you var_dumpit (although I think it works with print_rfor some reason) it doesn't show you its members.
它可能不是“空” -$xml->children();例如尝试。据我所知，SimpleXmlElement 的行为不像其他 PHP 对象，因为当您使用var_dump它时（尽管我认为它print_r出于某种原因可以使用），它不会向您显示其成员。
回答by FinalForm
It's working properly. The XML has just been stored in an object. So you can access it like any other object. So when you're dumping the contents of $xml, it's correct that you see it saying object. See below example. The below is just some random example. I just wanted to show you the arrow ->.
它工作正常。XML 刚刚存储在一个对象中。因此，您可以像访问任何其他对象一样访问它。因此，当您转储 $xml 的内容时，您看到它说对象是正确的。见下面的例子。以下只是一些随机示例。我只是想向您展示箭头 ->。
<?php
$xml = new SimpleXMLElement($xmlstr);
echo $xml->movie[0]->plot;
?>
