Fatal error: Call to undefined function domxml_open_mem()

Hi All,
Can u give me exact solution for this error.

Fatal error: Call to undefined function domxml_open_mem() in /home/test.php

I'm Using This Code.
$dom = domxml_open_mem($content);

// DEFINE THE REGULAR EXPRESSION FOR GRABBING FIELDS
$id_string = "/\<id-number\>.*\<\/id-number\>/";
// GRAB THE ID VALUE
preg_match($id_string, $content, $result);
$id = $result[0];
// REMOVE XML TAGS
$id = preg_replace("/<.?id-number>/", '', $id);
// PARSE REMAINING XML
$responses = array(); // MAIN RESPONSE VALUES
$qualifiers = array(); // ANY QUALIFIERS (INCLUDING RESPONSES)

//$dom = domxml_open_mem($content);
$dom = domxml_open_mem($content);

$result_nodes = $dom->get_elements_by_tagname('response');
foreach ($result_nodes as $node) {
$key = $node->get_content();
$responses[] = $key;
}
$results['responses'] = $responses;
$qualifier_nodes = $dom->get_elements_by_tagname('qualifier');
foreach ($qualifier_nodes as $node) {
$key = $node->get_content();
$qualifiers[] = $key;
}
$results['qualifiers'] = $qualifiers;
//****************************
echo "Resut 1" .$results['qualifiers'];

echo "<br>";
echo "Resut 2".$qualifiers;
//****************************
$dom->free();

 

What version of PHP? domxml_open_mem is only supported in PHP 4.2.1 and greater.

 

yep, the error usually means the function that you are trying to use does not exist, either a custom one or built in