[PHP] About DOM function in PHP

[Kelvin Park]

I'm getting the following fatal error message:

*Fatal error*: Cannot instantiate non-existent class: domdocument in *
/home/hosting/infotechnow_com/htdocs/admin/inventory/catalog.php* on line *3
*
when running this code:

// Initialize new object for DOMDocument
$doc = new DOMDocument();

What's the problem?
**