php_xml_parser_expat.asp

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<h2>An XML File</h2>
<p>The XML file below will be used in our example:</p>
<table class="ex" cellspacing="0" width="100%" border="1">
  <tr>
    <td>
    <pre>&lt;?xml version=&quot;1.0&quot; encoding=&quot;ISO-8859-1&quot;?&gt;
&lt;note&gt;
&lt;to&gt;Tove&lt;/to&gt;
&lt;from&gt;Jani&lt;/from&gt;
&lt;heading&gt;Reminder&lt;/heading&gt;
&lt;body&gt;Don't forget me this weekend!&lt;/body&gt;
&lt;/note&gt;</pre>
    </td>
  </tr>
</table>
<br />
<hr />

<h2>Initializing the XML Parser</h2>
<p>We want to initialize the XML parser in PHP, define some handlers for different 
XML events, and then parse the XML file.</p>
<h3><b>Example</b></h3>
<table width="100%" border="1" class="ex" cellspacing="0">
<tr><td>
<pre>&lt;?php</pre>
<pre>//Initialize the XML parser
$parser=xml_parser_create();</pre>
<pre>//Function to use at the start of an element
function start($parser,$element_name,$element_attrs)
  {
  switch($element_name)
    {
    case &quot;NOTE&quot;:
    echo &quot;-- Note --&lt;br /&gt;&quot;;
    break; 
    case &quot;TO&quot;:
    echo &quot;To: &quot;;
    break; 
    case &quot;FROM&quot;:
    echo &quot;From: &quot;;
    break; 
    case &quot;HEADING&quot;:
    echo &quot;Heading: &quot;;
    break; 
    case &quot;BODY&quot;:
    echo &quot;Message: &quot;;
    }
  }</pre>
<pre>//Function to use at the end of an element
function stop($parser,$element_name)
  {
  echo &quot;&lt;br /&gt;&quot;;
  }</pre>
<pre>//Function to use when finding character data
function char($parser,$data)
  {
  echo $data;
  }</pre>
<pre>//Specify element handler
xml_set_element_handler($parser,&quot;start&quot;,&quot;stop&quot;);</pre>
<pre>//Specify data handler
xml_set_character_data_handler($parser,&quot;char&quot;);</pre>
<pre>//Open XML file
$fp=fopen(&quot;test.xml&quot;,&quot;r&quot;);</pre>
<pre>//Read data
while ($data=fread($fp,4096))
  {
  xml_parse($parser,$data,feof($fp)) or 
  die (sprintf(&quot;XML Error: %s at line %d&quot;, 
  xml_error_string(xml_get_error_code($parser)),
  xml_get_current_line_number($parser)));
  }</pre>
<pre>//Free the XML parser
xml_parser_free($parser);</pre>
<pre>?&gt;</pre>
</td></tr></table>
<p>The output of the code above will be:</p>
<table class="ex" id="table1" border="1" cellspacing="0" width="100%">
	<tr>
		<td>
		<pre>-- Note --
To: Tove
From: Jani
Heading: Reminder
Message: Don't forget me this weekend!</pre>
		</td>
	</tr>
</table>
<p>How it works:</p>
<ol>
	<li>Initialize the XML parser with the xml_parser_create() function</li>
	<li>Create functions to use with the different event handlers</li>
	<li>Add the xml_set_element_handler() function to specify which function 
	will be executed when the parser encounters the opening and closing tags</li>
	<li>Add the xml_set_character_data_handler() function to specify which 
	function will execute when the parser encounters character data</li>
	<li>Parse the file &quot;test.xml&quot; with the xml_parse() function</li>
	<li>In case of an error, add&nbsp; xml_error_string() function to convert an 
	XML error to a textual description</li>
	<li>Call the xml_parser_free() function to release the memory allocated with the xml_parser_create() 
	function</li>
</ol>
<hr />

<h2>More PHP Expat Parser</h2>
<p>For more information about the PHP Expat functions, visit our
<a href="php_ref_xml.asp">PHP XML Parser Reference.</a><br />
</p>
<hr />

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