Query whether WooCommerce is activated

If you’re building a theme which supports but doesn’t require WooCommerce, you may want to wrap WooCommerce functionality (think cart links etc) inside a conditional query. That way, if WooCommerce isn’t activated, the functionality is simply ignored instead of producing fatal errors.

/**
 * Check if WooCommerce is activated
 */
if ( ! function_exists( 'is_woocommerce_activated' ) ) {
	function is_woocommerce_activated() {
		if ( class_exists( 'woocommerce' ) ) { return true; } else { return false; }
	}
}