Editing Drupal (section)

===Themes===
{{As of|2019|12}}, there are more than 2,800 free community-contributed [[theme (computing)|theme]]s.<ref name=":1">{{Cite web |date=18 March 2022 |title=Theme project {{!}} Drupal.org |url=https://www.drupal.org/project/project_theme |url-status=live |archive-url=https://archive.today/20220318195454/https://www.drupal.org/project/project_theme#selection-761.0-761.13 |archive-date=18 March 2022 |access-date=21 September 2017 |website=www.drupal.org}}</ref> Themes adapt or replace a Drupal site's default look and feel.

Drupal themes use standardized formats that may be generated by common third-party theme design engines. Many are written in the [[PHPTemplate]] engine<ref>{{Cite web | url=http://drupal.org/phptemplate | title=PHPTemplate theme engine | work=drupal.org | access-date=8 April 2009 | url-status=dead | archive-url=https://web.archive.org/web/20090308030334/http://drupal.org/phptemplate | archive-date=8 March 2009 }}</ref> or, to a lesser extent, the [[XTemplate]] engine.<ref>{{Cite web | url=http://drupal.org/node/6493 | title=XTemplate theme engine | work=drupal.org | access-date=8 April 2009 | url-status=dead | archive-url=https://web.archive.org/web/20090316205154/http://drupal.org/node/6493 | archive-date=16 March 2009 }}</ref> Some templates use hard-coded [[PHP]]. Drupal 8 and future versions of Drupal integrate the [[Twig (template engine)|Twig]] templating engine.<ref name=":5">{{Cite web |last=Arghire |first=Ionut |date=29 September 2022 |title=Drupal Updates Patch Vulnerability in Twig Template Engine {{!}} SecurityWeek.Com |url=https://www.securityweek.com/drupal-updates-patch-vulnerability-twig-template-engine |access-date=11 October 2022 |website=www.securityweek.com}}</ref>

The inclusion of the PHPTemplate and XTemplate engines in Drupal addressed user concerns about flexibility and complexity.<ref>{{Cite web | url=http://drupal.org/node/15689#comment-25704 | title=How does Drupal compare to Mambo? discussion thread | work=drupal.org | date=17 January 2005 | access-date=8 April 2009}}</ref> The Drupal theming system utilizes a [[Template engine (web)|template engine]] to further separate [[HTML]]/[[CSS]] from PHP. A popular Drupal contributed module called 'Devel' provides GUI information to developers and themers about the page build.

Community-contributed themes on the Drupal website are released under a free [[GNU General Public License|GPL]] license.<ref>{{Cite web| url=http://drupal.org/project/Themes| title=Drupal themes| publisher=Drupal.org| access-date=31 August 2011| archive-date=23 August 2007| archive-url=https://web.archive.org/web/20070823232913/http://drupal.org/project/Themes| url-status=dead}}</ref><ref>{{Cite web | url=http://drupal.org/node/14208 | title=Adding your theme to Drupal.org|publisher=Drupal.org}}</ref>