How to solve "call to undefined function domxml_new_doc()...."

I am trying to output xml by using domxml_new_doc.

However, I just got the call to undefined functi开发者_如何转开发on domxml_new_doc() error. I tried google it but still not luck. Do I have to install any extension or library? Thanks for the help.

 $doc=domxml_new_doc("1.0"); //error on this line....
$node=$doc->create_element("marker");
$parnode=$doc->append_child($node);

What PHP version are you using? You need to ensure that make sure you have the domxml library/extension.

you can see the requirements here. Quote:

This extension makes use of the » GNOME XML library. Download and install this library. You will need at least libxml-2.4.14. To use DOM XSLT features you can use the » libxslt library and EXSLT enhancements from » http://www.exslt.org/. Download and install these libraries if you plan to use (enhanced) XSLT features. You will need at least libxslt-1.0.18.