php读取xml的问题
我有一个这样的XML文件，我想把question、oid、content都输出，而且输出的格式为：
问题：542
选项：A 内容：1111111
选项：B 内容：2222222
问题：123
选项：C 内容：3333333
选项：D 内容：4444444
应该如何做？
<?xml version="1.0" encoding="utf-8"?><br /><parent><br /> <title>3</title><br /> <author>admin</author><br /> <contentall><br /> <subject><br /> <question>542</question><br /> <option><br /> <oid>A</oid><br /> <content>1111111</content><br /> </option><br /> <option><br /> <oid>B</oid><br /> <content>2222222</content><br /> </option><br /> </subject><br /> <subject><br /> <question>123</question><br /> <option><br /> <oid>C</oid><br /> <content>3333333</content><br /> </option><br /> <option><br /> <oid>D</oid><br /> <content>4444444</content><br /> </option><br /> </subject><br /> </contentall><br /></parent><br />
$s =<?xml version="1.0" encoding="utf-8"?><br><parent><br> <title>3</title><br> <author>admin</author><br> <contentall><br> <subject><br> <question>542</question><br> <option>
<br> <oid>A</oid><br> <content>1111111</content><br> </option>
<br> <option>
<br> <oid>B</oid><br> <content>2222222</content><br> </option>
<br> </subject><br> <subject><br> <question>123</question><br> <option>
<br> <oid>C</oid><br> <content>3333333</content><br> </option>
<br> <option>
<br> <oid>D</oid><br> <content>4444444</content><br> </option>
<br> </subject><br> </contentall><br></parent><br>XML;<br><br>$xml = simplexml_load_string($s);<div class="clear">
</div>
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