<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >DOMNodelist->item()</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="DOM Functions" HREF="ref.dom.html"><LINK REL="PREVIOUS" TITLE="DOMNode->replaceChild()" HREF="function.dom-domnode-replacechild.html"><LINK REL="NEXT" TITLE="DOMProcessingInstruction->__construct()" HREF="function.dom-domprocessinginstruction-construct.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.dom-domnode-replacechild.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.dom-domprocessinginstruction-construct.html" ACCESSKEY="N" >下一页</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.dom-domnodelist-item" ></A >DOMNodelist->item()</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN42406" ></A ><P > (no version information, might be only in CVS)</P >DOMNodelist->item() -- Retrieves a node specified by index </DIV ><DIV CLASS="refsect1" ><A NAME="AEN42409" ></A ><H2 >说明</H2 >class <B CLASS="classname" >DOMNodeList</B > { <BR ></BR >DOMNode <B CLASS="methodname" >item</B > ( int index )<BR ></BR >}<P > Retrieves a node specified by <CODE CLASS="parameter" >index</CODE > within the <B CLASS="classname" >DOMNodeList</B > object. </P ><DIV CLASS="tip" ><BLOCKQUOTE CLASS="tip" ><P ><B >提示: </B > If you need to know the number of nodes in the collection, use the <TT CLASS="literal" >length</TT > property of the <B CLASS="classname" >DOMNodeList</B > object. </P ></BLOCKQUOTE ></DIV ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN42427" ></A ><H2 >参数</H2 ><P > <P ></P ><DIV CLASS="variablelist" ><DL ><DT ><CODE CLASS="parameter" >index</CODE ></DT ><DD ><P > Index of the node into the collection. </P ></DD ></DL ></DIV > </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN42436" ></A ><H2 >返回值</H2 ><P > The node at the <CODE CLASS="parameter" >index</CODE >th position in the <B CLASS="classname" >DOMNodeList</B >, or <TT CLASS="constant" ><B >NULL</B ></TT > if that is not a valid index. </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN42442" ></A ><H2 >范例</H2 ><P > <TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN42445" ></A ><P ><B >例 1. Traversing all the entries of the table</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br /><br />$doc </font><font color="#007700">= new </font><font color="#0000BB">DOMDocument</font><font color="#007700">;<br /></font><font color="#0000BB">$doc</font><font color="#007700">-></font><font color="#0000BB">load</font><font color="#007700">(</font><font color="#DD0000">'book.xml'</font><font color="#007700">);<br /><br /></font><font color="#0000BB">$items </font><font color="#007700">= </font><font color="#0000BB">$doc</font><font color="#007700">-></font><font color="#0000BB">getElementsByTagName</font><font color="#007700">(</font><font color="#DD0000">'entry'</font><font color="#007700">);<br /><br />for (</font><font color="#0000BB">$i </font><font color="#007700">= </font><font color="#0000BB">0</font><font color="#007700">; </font><font color="#0000BB">$i </font><font color="#007700">< </font><font color="#0000BB">$items</font><font color="#007700">-></font><font color="#0000BB">length</font><font color="#007700">; </font><font color="#0000BB">$i</font><font color="#007700">++) {<br /> echo </font><font color="#0000BB">$items</font><font color="#007700">-></font><font color="#0000BB">item</font><font color="#007700">(</font><font color="#0000BB">$i</font><font color="#007700">)-></font><font color="#0000BB">nodeValue </font><font color="#007700">. </font><font color="#DD0000">"\n"</font><font color="#007700">;<br />}<br /><br /></font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ><P > Alternatively, you can use foreach, which is a much more convenient way: </P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br /><br /></font><font color="#007700">foreach (</font><font color="#0000BB">$items </font><font color="#007700">as </font><font color="#0000BB">$item</font><font color="#007700">) {<br /> echo </font><font color="#0000BB">$item</font><font color="#007700">-></font><font color="#0000BB">nodeValue </font><font color="#007700">. </font><font color="#DD0000">"\n"</font><font color="#007700">;<br />}<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" >Title Author Language ISBN The Grapes of Wrath John Steinbeck en 0140186409 The Pearl John Steinbeck en 014017737X Samarcande Amine Maalouf fr 2253051209</PRE ></TD ></TR ></TABLE ></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.dom-domnode-replacechild.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.dom-domprocessinginstruction-construct.html" ACCESSKEY="N" >下一页</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >DOMNode->replaceChild()</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.dom.html" ACCESSKEY="U" >上一级</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >DOMProcessingInstruction->__construct()</TD ></TR ></TABLE ></DIV ></BODY ></HTML >