PHP Warning: Use of undefined constant LIBXML_HTML_NODEFDTD – assumed ‘LIBXML_H

Hi @macken,

The constant LIBXML_HTML_NODEFDTD should be defined by default starting from PHP 5.4 onwards, and since release 1.5, the plugin requires PHP 5.6+.

Can you confirm that you are running at least PHP 5.6 or higher?

This reminds me of the INTL_IDNA_VARIANT_2003 reports we sometimes see due to outdated libraries.

In addition to verifying the PHP version, if you check the PHP information (i.e. using phpinfo()), could you verify that your server is running libxml >= 2.7.8?

Check php info

dom
DOM/XML enabled
DOM/XML API Version 20031129
libxml Version 2.7.6
HTML Support enabled
XPath Support enabled
XPointer Support enabled
Schema Support enabled
RelaxNG Support enabled

and command vps :

php -i | grep libxml
libxml Version => 2.7.6
libxml
libxml2 Version => 2.7.6

plz help update libxml version new on Linux
Centos 6.8
PHP version: 7.3.16
nginx version: nginx/1.17.5

Thanks

Your libxml version is indeed too low, and it is lower than what it should be for the PHP version you’re running.

I’ll look into whether I can get around the requirement for the libxml version we need.

In the mean-time, I would recommend talking to your hosting provider to find out whether they can update the version of libxml that is being used by PHP. This would not only fix the error above, but also generally improve DOM handling for your PHP version and make it more secure.

@macken Version 1.5.1 should fix your issue. Please update the plugin to that version and confirm whether the issue is fixed for you or not.

(It would still be a good idea to nag your hosting provider about the libxml version, though)

Thank you!

Thanks @alain Schlesser

libxml 2.7.6 max support centos 6.8

Thanks AMP V1.5.1