How can I check if a plugin is installed and enabled, in Craft 3?

Question

In a question I asked a few years ago, it was very simple to perform a check on wether a plugin was installed or not.

As of Craft 3, the same methods don't seem to work. The likes of this always returns true:

{{ craft.myPlugin is defined ? 'Installed' : 'Not Installed' }}

Is there another way to determine if a specific plugin is installed and enabled?

Answer 1

PHP

\Craft::$app->plugins->isPluginInstalled('plugin-handle')

Twig

{% set installed = craft.app.plugins.isPluginInstalled('plugin-handle') %}

There is also a isPluginDisabled and a isPluginEnabled function. Here is a class reference craft\services\Plugins