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  5.   <title>XML 元素结构例程</title>
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  13. </div><hr /><div id="example.xml-structure" class="section">
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  14.   <h2 class="title">XML 元素结构例程</h2>
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  15.   <p class="para">
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  16.    第一个例程缩进显示文档中的开始元素结构。
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  17.    <div class="example" id="example-5247">
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  18.     <p><strong>Example #1 显示 XML 元素结构</strong></p>
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  19.     <div class="example-contents">
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  20. <div class="phpcode"><code><span style="color: #000000">
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  21. <span style="color: #0000BB">&lt;?php<br />$file&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">"data.xml"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$depth&nbsp;</span><span style="color: #007700">=&nbsp;array();<br /><br />function&nbsp;</span><span style="color: #0000BB">startElement</span><span style="color: #007700">(</span><span style="color: #0000BB">$parser</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$name</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$attrs</span><span style="color: #007700">)&nbsp;<br />{<br />&nbsp;&nbsp;&nbsp;&nbsp;global&nbsp;</span><span style="color: #0000BB">$depth</span><span style="color: #007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;for&nbsp;(</span><span style="color: #0000BB">$i&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">;&nbsp;</span><span style="color: #0000BB">$i&nbsp;</span><span style="color: #007700">&lt;&nbsp;</span><span style="color: #0000BB">$depth</span><span style="color: #007700">[</span><span style="color: #0000BB">$parser</span><span style="color: #007700">];&nbsp;</span><span style="color: #0000BB">$i</span><span style="color: #007700">++)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"&nbsp;&nbsp;"</span><span style="color: #007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;}<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"</span><span style="color: #0000BB">$name</span><span style="color: #DD0000">\n"</span><span style="color: #007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$depth</span><span style="color: #007700">[</span><span style="color: #0000BB">$parser</span><span style="color: #007700">]++;<br />}<br /><br />function&nbsp;</span><span style="color: #0000BB">endElement</span><span style="color: #007700">(</span><span style="color: #0000BB">$parser</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$name</span><span style="color: #007700">)&nbsp;<br />{<br />&nbsp;&nbsp;&nbsp;&nbsp;global&nbsp;</span><span style="color: #0000BB">$depth</span><span style="color: #007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$depth</span><span style="color: #007700">[</span><span style="color: #0000BB">$parser</span><span style="color: #007700">]--;<br />}<br /><br /></span><span style="color: #0000BB">$xml_parser&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">xml_parser_create</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">xml_set_element_handler</span><span style="color: #007700">(</span><span style="color: #0000BB">$xml_parser</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"startElement"</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"endElement"</span><span style="color: #007700">);<br />if&nbsp;(!(</span><span style="color: #0000BB">$fp&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">fopen</span><span style="color: #007700">(</span><span style="color: #0000BB">$file</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"r"</span><span style="color: #007700">)))&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;die(</span><span style="color: #DD0000">"could&nbsp;not&nbsp;open&nbsp;XML&nbsp;input"</span><span style="color: #007700">);<br />}<br /><br />while&nbsp;(</span><span style="color: #0000BB">$data&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">fread</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">4096</span><span style="color: #007700">))&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(!</span><span style="color: #0000BB">xml_parse</span><span style="color: #007700">(</span><span style="color: #0000BB">$xml_parser</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$data</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">feof</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">)))&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;die(</span><span style="color: #0000BB">sprintf</span><span style="color: #007700">(</span><span style="color: #DD0000">"XML&nbsp;error:&nbsp;%s&nbsp;at&nbsp;line&nbsp;%d"</span><span style="color: #007700">,<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">xml_error_string</span><span style="color: #007700">(</span><span style="color: #0000BB">xml_get_error_code</span><span style="color: #007700">(</span><span style="color: #0000BB">$xml_parser</span><span style="color: #007700">)),<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">xml_get_current_line_number</span><span style="color: #007700">(</span><span style="color: #0000BB">$xml_parser</span><span style="color: #007700">)));<br />&nbsp;&nbsp;&nbsp;&nbsp;}<br />}<br /></span><span style="color: #0000BB">xml_parser_free</span><span style="color: #007700">(</span><span style="color: #0000BB">$xml_parser</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?&gt;</span>
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  22. </span>
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  23. </code></div>
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