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>DOMXPath-&#62;query()</H1
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NAME="AEN42671"
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><P
>    (no version information, might be only in CVS)</P
>DOMXPath-&#62;query()&nbsp;--&nbsp;
   Evaluates the given XPath expression 
  </DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN42674"
></A
><H2
>说明</H2
>class <B
CLASS="classname"
>DOMXPath</B
> { <BR
></BR
>DOMNodeList <B
CLASS="methodname"
>query</B
> ( string expression [, DOMNode contextnode] )<BR
></BR
>}<P
>&#13;   Executes the given XPath <CODE
CLASS="parameter"
>expression</CODE
>.
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN42690"
></A
><H2
>参数</H2
><P
>&#13;   <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="parameter"
>expression</CODE
></DT
><DD
><P
>&#13;       The XPath expression to execute.
      </P
></DD
><DT
><CODE
CLASS="parameter"
>contextnode</CODE
></DT
><DD
><P
>&#13;       The optional <CODE
CLASS="parameter"
>contextnode</CODE
> can be specified for
       doing relative XPath queries. By default, the queries are relative to 
       the root element.
      </P
></DD
></DL
></DIV
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN42705"
></A
><H2
>返回值</H2
><P
>&#13;   Returns a <B
CLASS="classname"
>DOMNodeList</B
> containing all nodes matching 
   the given XPath <CODE
CLASS="parameter"
>expression</CODE
>. Any expression which do
   not return nodes will return an empty <B
CLASS="classname"
>DOMNodeList</B
>.
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN42711"
></A
><H2
>范例</H2
><P
>&#13;   <TABLE
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CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN42714"
></A
><P
><B
>例 1. Getting all the english books</B
></P
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br /><br />$doc </font><font color="#007700">= new </font><font color="#0000BB">DOMDocument</font><font color="#007700">;<br /><br /></font><font color="#FF8000">// We don't want to bother with white spaces<br /></font><font color="#0000BB">$doc</font><font color="#007700">-&gt;</font><font color="#0000BB">preserveWhiteSpace </font><font color="#007700">= </font><font color="#0000BB">false</font><font color="#007700">;<br /><br /></font><font color="#0000BB">$doc</font><font color="#007700">-&gt;</font><font color="#0000BB">Load</font><font color="#007700">(</font><font color="#DD0000">'book.xml'</font><font color="#007700">);<br /><br /></font><font color="#0000BB">$xpath </font><font color="#007700">= new </font><font color="#0000BB">DOMXPath</font><font color="#007700">(</font><font color="#0000BB">$doc</font><font color="#007700">);<br /><br /></font><font color="#FF8000">// We starts from the root element<br /></font><font color="#0000BB">$query </font><font color="#007700">= </font><font color="#DD0000">'//book/chapter/para/informaltable/tgroup/tbody/row/entry[. = "en"]'</font><font color="#007700">;<br /><br /></font><font color="#0000BB">$entries </font><font color="#007700">= </font><font color="#0000BB">$xpath</font><font color="#007700">-&gt;</font><font color="#0000BB">query</font><font color="#007700">(</font><font color="#0000BB">$query</font><font color="#007700">);<br /><br />foreach (</font><font color="#0000BB">$entries </font><font color="#007700">as </font><font color="#0000BB">$entry</font><font color="#007700">) {<br />&nbsp;&nbsp;&nbsp;&nbsp;echo </font><font color="#DD0000">"Found </font><font color="#007700">{</font><font color="#DD0000">$entry</font><font color="#007700">-&gt;</font><font color="#DD0000">previousSibling</font><font color="#007700">-&gt;</font><font color="#DD0000">previousSibling</font><font color="#007700">-&gt;</font><font color="#DD0000">nodeValue</font><font color="#007700">}</font><font color="#DD0000">," </font><font color="#007700">.<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#DD0000">" by </font><font color="#007700">{</font><font color="#DD0000">$entry</font><font color="#007700">-&gt;</font><font color="#DD0000">previousSibling</font><font color="#007700">-&gt;</font><font color="#DD0000">nodeValue</font><font color="#007700">}\n</font><font color="#DD0000">"</font><font color="#007700">;<br />}<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
></TR
></TABLE
><P
>上例将输出：</P
><TABLE
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><TR
><TD
><PRE
CLASS="screen"
>Found The Grapes of Wrath, by John Steinbeck
Found The Pearl, by John Steinbeck</PRE
></TD
></TR
></TABLE
><P
>&#13;     We can also use the <CODE
CLASS="parameter"
>contextnode</CODE
> parameter to shorten
     our expression:
    </P
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br /><br />$doc </font><font color="#007700">= new </font><font color="#0000BB">DOMDocument</font><font color="#007700">;<br /></font><font color="#0000BB">$doc</font><font color="#007700">-&gt;</font><font color="#0000BB">preserveWhiteSpace </font><font color="#007700">= </font><font color="#0000BB">false</font><font color="#007700">;<br /><br /></font><font color="#0000BB">$doc</font><font color="#007700">-&gt;</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">$xpath </font><font color="#007700">= new </font><font color="#0000BB">DOMXPath</font><font color="#007700">(</font><font color="#0000BB">$doc</font><font color="#007700">);<br /><br /></font><font color="#0000BB">$tbody </font><font color="#007700">= </font><font color="#0000BB">$doc</font><font color="#007700">-&gt;</font><font color="#0000BB">getElementsByTagName</font><font color="#007700">(</font><font color="#DD0000">'tbody'</font><font color="#007700">)-&gt;</font><font color="#0000BB">item</font><font color="#007700">(</font><font color="#0000BB">0</font><font color="#007700">);<br /><br /></font><font color="#FF8000">// our query is relative to the tbody node<br /></font><font color="#0000BB">$query </font><font color="#007700">= </font><font color="#DD0000">'row/entry[. = "en"]'</font><font color="#007700">;<br /><br /></font><font color="#0000BB">$entries </font><font color="#007700">= </font><font color="#0000BB">$xpath</font><font color="#007700">-&gt;</font><font color="#0000BB">query</font><font color="#007700">(</font><font color="#0000BB">$query</font><font color="#007700">, </font><font color="#0000BB">$tbody</font><font color="#007700">);<br /><br />foreach (</font><font color="#0000BB">$entries </font><font color="#007700">as </font><font color="#0000BB">$entry</font><font color="#007700">) {<br />&nbsp;&nbsp;&nbsp;&nbsp;echo </font><font color="#DD0000">"Found </font><font color="#007700">{</font><font color="#DD0000">$entry</font><font color="#007700">-&gt;</font><font color="#DD0000">previousSibling</font><font color="#007700">-&gt;</font><font color="#DD0000">previousSibling</font><font color="#007700">-&gt;</font><font color="#DD0000">nodeValue</font><font color="#007700">}</font><font color="#DD0000">," </font><font color="#007700">.<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#DD0000">" by </font><font color="#007700">{</font><font color="#DD0000">$entry</font><font color="#007700">-&gt;</font><font color="#DD0000">previousSibling</font><font color="#007700">-&gt;</font><font color="#DD0000">nodeValue</font><font color="#007700">}\n</font><font color="#DD0000">"</font><font color="#007700">;<br />}<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
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></TD
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>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN42722"
></A
><H2
>参见</H2
><P
>&#13;   <P
></P
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><A
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>DOMXPath-&#62;evaluate()</A
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></P
>
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