<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >SimpleXMLElement->xpath()</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REL="HOME" TITLE="PHP 手册" HREF="index.html"><LINK REL="UP" TITLE="SimpleXML functions" HREF="ref.simplexml.html"><LINK REL="PREVIOUS" TITLE="SimpleXMLElement->registerXPathNamespace()" HREF="function.simplexml-element-registerxpathnamespace.html"><LINK REL="NEXT" TITLE="simplexml_import_dom" HREF="function.simplexml-import-dom.html"><META HTTP-EQUIV="Content-type" CONTENT="text/html; charset=UTF-8"></HEAD ><BODY CLASS="refentry" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >PHP 手册</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="function.simplexml-element-registerxpathnamespace.html" ACCESSKEY="P" >上一页</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="function.simplexml-import-dom.html" ACCESSKEY="N" >下一页</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.simplexml-element-xpath" ></A >SimpleXMLElement->xpath()</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN209841" ></A ><P > (no version information, might be only in CVS)</P >SimpleXMLElement->xpath() -- Runs XPath query on XML data</DIV ><DIV CLASS="refsect1" ><A NAME="AEN209844" ></A ><H2 >说明</H2 >class <B CLASS="classname" >SimpleXMLElement</B > { <BR ></BR >array <B CLASS="methodname" >xpath</B > ( string path )<BR ></BR >}<P > The <TT CLASS="literal" >xpath</TT > method searches the SimpleXML node for children matching the <ACRONYM CLASS="acronym" >XPath</ACRONYM > <CODE CLASS="parameter" >path</CODE >. </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN209859" ></A ><H2 >参数</H2 ><P > <P ></P ><DIV CLASS="variablelist" ><DL ><DT ><CODE CLASS="parameter" >path</CODE ></DT ><DD ><P > An XPath path </P ></DD ></DL ></DIV > </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN209868" ></A ><H2 >返回值</H2 ><P > Always returns an <A HREF="language.types.array.html" ><B CLASS="type" >array</B ></A > of SimpleXMLElement objects. </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN209872" ></A ><H2 >范例</H2 ><P > <TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN209875" ></A ><P ><B >例 1. Xpath</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br />$string </font><font color="#007700">= <<<XML<br /></font><font color="#0000BB"><a><br /> <b><br /> <c>text</c><br /> <c>stuff</c><br /> </b><br /> <d><br /> <c>code</c><br /> </d><br /></a><br /></font><font color="#007700">XML;<br /><br /></font><font color="#0000BB">$xml </font><font color="#007700">= new </font><font color="#0000BB">SimpleXMLElement</font><font color="#007700">(</font><font color="#0000BB">$string</font><font color="#007700">);<br /><br /></font><font color="#FF8000">/* Search for <a><b><c> */<br /></font><font color="#0000BB">$result </font><font color="#007700">= </font><font color="#0000BB">$xml</font><font color="#007700">-></font><font color="#0000BB">xpath</font><font color="#007700">(</font><font color="#DD0000">'/a/b/c'</font><font color="#007700">);<br /><br />while(list( , </font><font color="#0000BB">$node</font><font color="#007700">) = </font><font color="#0000BB">each</font><font color="#007700">(</font><font color="#0000BB">$result</font><font color="#007700">)) {<br /> echo </font><font color="#DD0000">'/a/b/c: '</font><font color="#007700">,</font><font color="#0000BB">$node</font><font color="#007700">,</font><font color="#DD0000">"\n"</font><font color="#007700">;<br />}<br /><br /></font><font color="#FF8000">/* Relative paths also work... */<br /></font><font color="#0000BB">$result </font><font color="#007700">= </font><font color="#0000BB">$xml</font><font color="#007700">-></font><font color="#0000BB">xpath</font><font color="#007700">(</font><font color="#DD0000">'b/c'</font><font color="#007700">);<br /><br />while(list( , </font><font color="#0000BB">$node</font><font color="#007700">) = </font><font color="#0000BB">each</font><font color="#007700">(</font><font color="#0000BB">$result</font><font color="#007700">)) {<br /> echo </font><font color="#DD0000">'b/c: '</font><font color="#007700">,</font><font color="#0000BB">$node</font><font color="#007700">,</font><font color="#DD0000">"\n"</font><font color="#007700">;<br />}<br /></font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ><P >上例将输出:</P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><PRE CLASS="screen" >/a/b/c: text /a/b/c: stuff b/c: text b/c: stuff</PRE ></TD ></TR ></TABLE ><P > Notice that the two results are equal. </P ></DIV ></TD ></TR ></TABLE > </P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="function.simplexml-element-registerxpathnamespace.html" ACCESSKEY="P" >上一页</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >起始页</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="function.simplexml-import-dom.html" ACCESSKEY="N" >下一页</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >SimpleXMLElement->registerXPathNamespace()</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.simplexml.html" ACCESSKEY="U" >上一级</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >simplexml_import_dom</TD ></TR ></TABLE ></DIV ></BODY ></HTML >