This is a server-wide setting and requires administrator access to Plesk. If your subscription does not include it, open a ticket from your client area and tell us which module you need.
PHP modules (extensions) add functionality that applications rely on — image processing, database drivers, encryption and so on. If a CMS reports a missing extension, this is where it is enabled.
Enabling or disabling a module
- Open Tools & Settings → General Settings → PHP Settings.
- Click the name of the PHP version you want to change. Each version has its own set of modules.
- Tick the modules you want enabled, and untick any you do not need.
- Save the changes.
Modules are enabled per PHP version, not per site. If a site does not see the extension after you have enabled it, check which PHP version that domain is actually using — see Choosing the PHP version and changing PHP settings in Plesk.
Points worth knowing
- Changes take effect after PHP is restarted, which Plesk normally does itself. If the module still does not appear, restart the web server.
- Enable only the modules you actually need. Every extension loads into every PHP process, consuming memory and adding to the code exposed to an attacker.
- Disabling a module that a site is using will break that site immediately. If you are not sure whether something is in use, leave it enabled.
- If the module you need is not in the list at all, it is not installed on the server. Open a ticket and we will look at whether it can be added.
Checking the result
The simplest check is the CMS itself — the message about the missing extension should disappear. Alternatively, ask PHP directly on the server:
php -m
Note that the command line may use a different PHP version from the website, so a module can be present in one and absent in the other.
If a module cannot be enabled, or the site does not see it after the change, open a ticket from your client area with the domain name and the name of the module.
