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is_network_only_plugin( string $plugin )

Checks for “Network: true” in the plugin header to see if this should be activated only as a network wide plugin. The plugin would also work when Multisite is not enabled.

Description

Checks for "Site Wide Only: true" for backward compatibility.

Parameters

$plugin

(string) (Required) Path to the plugin file relative to the plugins directory.

Return

(bool) True if plugin is network only, false otherwise.

Source

File: wp-admin/includes/plugin.php 

function is_network_only_plugin( $plugin ) {
	$plugin_data = get_plugin_data( WP_PLUGIN_DIR . '/' . $plugin );
	if ( $plugin_data ) {
		return $plugin_data['Network'];
	}
	return false;
}

Uses

Uses Description
wp-admin/includes/plugin.php: get_plugin_data()

Parses the plugin contents to retrieve plugin’s metadata.

Used By

Used By Description
wp-includes/rest-api/endpoints/class-wp-rest-plugins-controller.php: WP_REST_Plugins_Controller::handle_plugin_status()

Handle updating a plugin’s status.
wp-includes/rest-api/endpoints/class-wp-rest-plugins-controller.php: WP_REST_Plugins_Controller::check_read_permission()

Checks if the given plugin can be viewed by the current user.
wp-admin/includes/class-wp-plugins-list-table.php: WP_Plugins_List_Table::single_row()
wp-admin/includes/class-wp-plugins-list-table.php: WP_Plugins_List_Table::prepare_items()
wp-admin/includes/plugin.php: activate_plugin()

Attempts activation of plugin in a “sandbox” and redirects on success.
wp-admin/includes/ms-deprecated.php: is_wpmu_sitewide_plugin()

Deprecated functionality for determining if the current plugin is network-only.

Changelog

Version Description
3.0.0 Introduced.

© 2003–2019 WordPress Foundation
Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/functions/is_network_only_plugin