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.

For more information on this and similar theme functions, check out the Conditional Tags article in the Theme Developer Handbook.

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 5.0.3}

<?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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