Fires as a specific plugin is being activated. This hook is the “activation” hook used internally by register_activation_hook(). The dynamic portion of the hook name, `$plugin`, refers to the plugin basename.
If a plugin is silently activated (such as during an update), this hook does not fire.
- ( 2.0.0 ) . .
- ( bool ) Whether to enable the plugin for all sites in the network or just the current site. Multisite only. Default is false. . . .