is_plugin_active() WP 1.0

Check whether a plugin is active.

Only plugins installed in the plugins/ folder can be active.

Plugins in the mu-plugins/ folder can't be "activated," so this function will return false for those plugins.

No Hooks.

Return

true/false. True, if in the active plugins list. False, not in the list.

Usage

is_plugin_active( $plugin );

$plugin(string) (required)

Path to the main plugin file from plugins directory.

Code of is_plugin_active: wp-admin/includes/plugin.php ^{VER 4.9.8}

<?php
function is_plugin_active( $plugin ) {
	return in_array( $plugin, (array) get_option( 'active_plugins', array() ) ) || is_plugin_active_for_network( $plugin );
}

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