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>SimpleXMLElement->registerXPathNamespace()</H1
><DIV
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><A
NAME="AEN209782"
></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="AEN209785"
></A
><H2
>说明</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="AEN209801"
></A
><H2
>参数</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="AEN209817"
></A
><H2
>返回值</H2
><P
> 如果成功则返回 <TT
CLASS="constant"
><B
>TRUE</B
></TT
>，失败则返回 <TT
CLASS="constant"
><B
>FALSE</B
></TT
>。
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN209822"
></A
><H2
>范例</H2
><P
> <TABLE
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><TR
><TD
><DIV
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><A
NAME="AEN209825"
></A
><P
><B
>例 1. Setting a namespace prefix to use in an XPath query</B
></P
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><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="AEN209832"
></A
><H2
>参见</H2
><P
> <P
></P
><TABLE
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><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
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></P
>
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