Sophie: php-manual-zh-5.2.4-1mdv2008.1 noarch

php-manual-zh-5.2.4-1mdv2008.1.noarch.rpm

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>DOMDocument-&#62;getElementById()</H1
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><A
NAME="AEN39475"
></A
><P
>    (no version information, might be only in CVS)</P
>DOMDocument-&#62;getElementById()&nbsp;--&nbsp;Searches for an element with a certain id</DIV
><DIV
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><A
NAME="AEN39478"
></A
><H2
>说明</H2
>class <B
CLASS="classname"
>DOMDocument</B
> { <BR
></BR
>DOMElement <B
CLASS="methodname"
>getElementById</B
> ( string elementId )<BR
></BR
>}<P
>&#13;   This function is similar to
   <A
HREF="function.dom-domdocument-getelementsbytagname.html"
>DOMDocument-&#62;getElementsByTagName()</A
> but 
   searches for an element with a given id.
  </P
><P
>&#13;   For this function to work, you will need either to set some ID attributes
   with <A
HREF="function.dom-domelement-setidattribute.html"
>DOMElement-&#62;setIdAttribute()</A
>
   or a DTD which defines an attribute to be of type ID. 
   In the later case, you will need to validate your document with
   <A
HREF="function.dom-domdocument-validate.html"
>DOMDocument-&#62;validate()</A
> 
   or <TT
CLASS="literal"
>DOMDocument-&#62;validateOnParse</TT
> before using this function.
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN39495"
></A
><H2
>参数</H2
><P
>&#13;   <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="parameter"
>elementId</CODE
></DT
><DD
><P
>&#13;       The unique id value for an element.
      </P
></DD
></DL
></DIV
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN39504"
></A
><H2
>返回值</H2
><P
>&#13;   Returns the <B
CLASS="classname"
>DOMElement</B
> or <TT
CLASS="constant"
><B
>NULL</B
></TT
> if the element is
   not found. 
  </P
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><DIV
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></A
><H2
>范例</H2
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><P
><B
>例 1. DOMDocument-&#62;getElementById() Example</B
></P
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br /><br />$doc </font><font color="#007700">= new </font><font color="#0000BB">DomDocument</font><font color="#007700">;<br /><br /></font><font color="#FF8000">// We need to validate our document before refering to the id<br /></font><font color="#0000BB">$doc</font><font color="#007700">-&gt;</font><font color="#0000BB">validateOnParse </font><font color="#007700">= </font><font color="#0000BB">true</font><font color="#007700">;<br /></font><font color="#0000BB">$doc</font><font color="#007700">-&gt;</font><font color="#0000BB">Load</font><font color="#007700">(</font><font color="#DD0000">'book.xml'</font><font color="#007700">);<br /><br />echo </font><font color="#DD0000">"The element whose id is books is: " </font><font color="#007700">. </font><font color="#0000BB">$doc</font><font color="#007700">-&gt;</font><font color="#0000BB">getElementById</font><font color="#007700">(</font><font color="#DD0000">'books'</font><font color="#007700">)-&gt;</font><font color="#0000BB">tagName </font><font color="#007700">. </font><font color="#DD0000">"\n"</font><font color="#007700">;<br /><br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
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><P
>上例将输出：</P
><TABLE
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>The element whose id is books is: chapter</PRE
></TD
></TR
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></TD
></TR
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></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN39516"
></A
><H2
>参见</H2
><P
>&#13;   <P
></P
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><A
HREF="function.dom-domdocument-getelementsbytagname.html"
>DOMDocument-&#62;getElementsByTagName()</A
></TD
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><P
></P
>
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