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>xpath_eval_expression</H1
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>    (PHP 4 &#62;= 4.0.4, PECL)</P
>xpath_eval_expression&nbsp;--&nbsp;
     Evaluates the XPath Location Path in the given string 
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>说明</H2
>class <B
CLASS="classname"
>XPathContext</B
> { <BR
></BR
>XPathObject <B
CLASS="methodname"
>xpath_eval_expression</B
> ( string expression [, domnode contextnode] )<BR
></BR
>}XPathObject <B
CLASS="methodname"
>xpath_eval_expression</B
> ( XPathContext xpath_context, string expression [, domnode contextnode] )<BR
></BR
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>&#13;     <TABLE
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>例 1. <B
CLASS="function"
>xpath_eval_expression()</B
> Example</B
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br /><br /></font><font color="#007700">include(</font><font color="#DD0000">"example.inc"</font><font color="#007700">);<br /><br />if (!</font><font color="#0000BB">$dom </font><font color="#007700">= </font><font color="#0000BB">domxml_open_mem</font><font color="#007700">(</font><font color="#0000BB">$xmlstr</font><font color="#007700">)) {<br />&nbsp;&nbsp;&nbsp;&nbsp;echo </font><font color="#DD0000">"Error while parsing the document\n"</font><font color="#007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;exit;<br />}<br /><br /></font><font color="#0000BB">$xpath </font><font color="#007700">= </font><font color="#0000BB">xpath_new_context</font><font color="#007700">(</font><font color="#0000BB">$dom</font><font color="#007700">);<br /></font><font color="#0000BB">var_dump</font><font color="#007700">(</font><font color="#0000BB">xpath_eval_expression</font><font color="#007700">(</font><font color="#0000BB">$xpath</font><font color="#007700">, </font><font color="#DD0000">'/chapter/@language'</font><font color="#007700">));<br /><br /></font><font color="#0000BB">?&gt;</font>
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>上例将输出：</P
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>object(XPathObject)(2) {
   ["type"]=&#62;
   int(1)
   ["nodeset"]=&#62;
   array(1) {
     [0]=&#62;
     object(domattribute)(5) {
       ["type"]=&#62;
       int(2)
       ["name"]=&#62;
       string(8) "language"
       ["value"]=&#62;
       string(2) "en"
       [0]=&#62;
       int(7)
       [1]=&#62;
       int(138004256)
     }
  }
}</PRE
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>
    </P
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>&#13;     See also <A
HREF="function.xpath-eval.html"
><B
CLASS="function"
>xpath_eval()</B
></A
>.
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