[Henry]

This is for single sites only:

if ( is_plugin_active('plugin-directory/plugin-file.php') ) {
  // the plugin is active
}

How can I apply same functions to Multisite network, check if any specific plugin is active now?

[Timothy]

Check If A WordPress Plugin Is Active

[Isabella]

Try this code for Multisite:

if( is_plugin_active_for_network( 'woocommerce/woocommerce.php') ) return;

source:

How To Check If a WordPress Plugin is “Sitewide Active” (or “Network Active”)

[Beverly]

only problem is if you use this code in a theme, you can’t use condition of is_network_admin cuz theme is not loaded there.

[Diana]

That’s true but you can still target is_main_site instead if you want to limit visibility from child sites.

[Christian]

another good article:

How to check if WooCommerce is activated on WP multisite

[Author]

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