<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >SimpleXMLElement->registerXPathNamespace()</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REL="HOME" TITLE="Manual do PHP" HREF="index.html"><LINK REL="UP" TITLE="SimpleXML functions" HREF="ref.simplexml.html"><LINK REL="PREVIOUS" TITLE="SimpleXMLElement->getNamespaces()" HREF="function.simplexml-element-getnamespaces.html"><LINK REL="NEXT" TITLE="SimpleXMLElement->xpath()" HREF="function.simplexml-element-xpath.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" >Manual do PHP</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="function.simplexml-element-getnamespaces.html" ACCESSKEY="P" >Anterior</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="function.simplexml-element-xpath.html" ACCESSKEY="N" >Próxima</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.simplexml-element-registerXPathNamespace" ></A >SimpleXMLElement->registerXPathNamespace()</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN205003" ></A ><P > (no version information, might be only in CVS)</P >SimpleXMLElement->registerXPathNamespace() -- Creates a prefix/ns context for the next XPath query </DIV ><DIV CLASS="refsect1" ><A NAME="AEN205006" ></A ><H2 >Descrição</H2 >class <B CLASS="classname" >SimpleXMLElement</B > { <BR ></BR >bool <B CLASS="methodname" >registerXPathNamespace</B > ( string prefix, string ns )<BR ></BR >}<P > Creates a prefix/ns context for the next XPath query. In particular, this is helpful if the provider of the given XML document alters the namespace prefixes. <TT CLASS="literal" >registerXPathNamespace</TT > will create a prefix for the associated namespace, allowing one to access nodes in that namespace without the need to change code to allow for the new prefixes dictated by the provider. </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN205022" ></A ><H2 >Parâmetros</H2 ><P > <P ></P ><DIV CLASS="variablelist" ><DL ><DT ><CODE CLASS="parameter" >prefix</CODE ></DT ><DD ><P > The namespace prefix to use in the XPath query for the namespace given in <CODE CLASS="parameter" >ns</CODE >. </P ></DD ><DT ><CODE CLASS="parameter" >ns</CODE ></DT ><DD ><P > The namespace to use for the XPath query. This must match a namespace in use by the XML document or the XPath query using <CODE CLASS="parameter" >prefix</CODE > will not return any results. </P ></DD ></DL ></DIV > </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN205038" ></A ><H2 >Valores de retornado</H2 ><P > Retorna <TT CLASS="constant" ><B >TRUE</B ></TT > em caso de sucesso ou <TT CLASS="constant" ><B >FALSE</B ></TT > em falhas. </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN205043" ></A ><H2 >Exemplos</H2 ><P > <TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN205046" ></A ><P ><B >Exemplo 1. Setting a namespace prefix to use in an XPath query</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br /><br />$xml </font><font color="#007700">= <<<EOD<br /></font><font color="#0000BB"><book xmlns:chap="http://example.org/chapter-title"><br /> <title>My Book</title><br /> <chapter id="1"><br /> <chap:title>Chapter 1</chap:title><br /> <para>Donec velit. Nullam eget tellus vitae tortor gravida scelerisque. <br /> In orci lorem, cursus imperdiet, ultricies non, hendrerit et, orci. <br /> Nulla facilisi. Nullam velit nisl, laoreet id, condimentum ut, <br /> ultricies id, mauris.</para><br /> </chapter><br /> <chapter id="2"><br /> <chap:title>Chapter 2</chap:title><br /> <para>Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Proin <br /> gravida. Phasellus tincidunt massa vel urna. Proin adipiscing quam <br /> vitae odio. Sed dictum. Ut tincidunt lorem ac lorem. Duis eros <br /> tellus, pharetra id, faucibus eu, dapibus dictum, odio.</para><br /> </chapter><br /></book><br /></font><font color="#007700">EOD;<br /><br /></font><font color="#0000BB">$sxe </font><font color="#007700">= new </font><font color="#0000BB">SimpleXMLElement</font><font color="#007700">(</font><font color="#0000BB">$xml</font><font color="#007700">);<br /><br /></font><font color="#0000BB">$sxe</font><font color="#007700">-></font><font color="#0000BB">registerXPathNamespace</font><font color="#007700">(</font><font color="#DD0000">'c'</font><font color="#007700">, </font><font color="#DD0000">'http://example.org/chapter-title'</font><font color="#007700">);<br /></font><font color="#0000BB">$result </font><font color="#007700">= </font><font color="#0000BB">$sxe</font><font color="#007700">-></font><font color="#0000BB">xpath</font><font color="#007700">(</font><font color="#DD0000">'//c:title'</font><font color="#007700">);<br /><br />foreach (</font><font color="#0000BB">$result </font><font color="#007700">as </font><font color="#0000BB">$title</font><font color="#007700">) {<br /> echo </font><font color="#0000BB">$title </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 > Notice how the XML document shown in the example sets a namespace with a prefix of <TT CLASS="literal" >chap</TT >. Imagine that this document (or another one like it) may have used a prefix of <TT CLASS="literal" >c</TT > in the past for the same namespace. Since it has changed, the XPath query will no longer return the proper results and the query will require modification. Using <TT CLASS="literal" >registerXPathNamespace</TT > avoids future modification of the query even if the provider changes the namespace prefix. </P ></DIV ></TD ></TR ></TABLE > </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN205053" ></A ><H2 >Veja também</H2 ><P > <P ></P ><TABLE BORDER="0" ><TBODY ><TR ><TD ><A HREF="function.simplexml-element-getdocnamespaces.html" >SimpleXMLElement->getDocNamespaces()</A ></TD ></TR ><TR ><TD ><A HREF="function.simplexml-element-getnamespaces.html" >SimpleXMLElement->getNamespaces()</A ></TD ></TR ></TBODY ></TABLE ><P ></P > </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-getnamespaces.html" ACCESSKEY="P" >Anterior</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Principal</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="function.simplexml-element-xpath.html" ACCESSKEY="N" >Próxima</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >SimpleXMLElement->getNamespaces()</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.simplexml.html" ACCESSKEY="U" >Acima</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >SimpleXMLElement->xpath()</TD ></TR ></TABLE ></DIV ></BODY ></HTML >