检查WooCommerce是否处于活动状态以及使用的版本

Question

I need to check if WooCommerce is active and check its version number to make it work differently for new and old versions.

I found that WC_VERSION stores version number, so if it exists, it also means that WooCommerce is active. The problem is that it can return anything only after plugins are loaded. I would like to check version and then use outside woocommerce_ver_check function in general scope. Can I do it without global variables?

I want to do something like this, but woocommerce_ver_check() is always null, because it executes after WooCommerce is loaded, unlike the rest of the code which is not assigned to any hook:

// Check WooCommerce version.
add_action('plugins_loaded', 'woocommerce_ver_check');
function woocommerce_ver_check() {
    if (defined('WC_VERSION')) return WC_VERSION; 
}

// Only if WooCommerce is active.
if (! woocommerce_ver_check() == null  ) {
    if ( version_compare( WC_VERSION, '3.0', '>=' ) ) {
        // new version code
    } else {
        // old version code
    }
}

Answer 1

You can also try to use the following (that is used for WooCommerce third party plugins):

if ( in_array( 'woocommerce/woocommerce.php', apply_filters( 'active_plugins', get_option( 'active_plugins' ) ) ) ) {
    if ( version_compare( WC_VERSION, '3.0', '<' ) ) {
        // Old version code (example)
        $product_id = $cart_item['data']->id
    } else {
        // New version code (example)
        $product_id = $cart_item['data']->get_id();
    }
}

For new WooCommerce 3 CRUD Object methods you can also use method_exists() like for example:

$order_id = method_exists( $order, 'get_id' ) ? $order->get_id() : $order->id;