Add custom bulk actions to admin orders list in Wo

In Woocommerce backend (admin), I have a function that allows the shop-manager to download all orders between two dates with a specific bunch of required data:

function write_to_file($date_initial, $date_final) {
    global $attach_download_dir, $attach_download_file;

    // Opens/creates file
    $myfile = fopen($attach_download_dir . '/' . $attach_download_file, "w") or die("Unable to open file!");

    // Populates first line
    fwrite($myfile, 'Date; Parent Order ID; Order ID' . PHP_EOL);

    // Retrieves orders data
    if ( isset($date_initial) && isset($date_final) ) $args = array( 'date_created' => $date_initial . '...' . $date_final );
    if ( isset($date_initial) && empty($date_final) ) $args = array( 'date_created' => '>=' . $date_initial );
    if ( empty($date_initial) && isset($date_final) ) $args = array( 'date_created' => '<=' . $date_final );
    if ( empty($date_initial) && empty($date_final) ) $args = array( );
    $orders = wc_get_orders( $args );

    // Populates file with orders data
    foreach ($orders as $order) {
        $order_data = $order->get_data();
        fwrite($myfile,
            // Date of order creation
            $order_data['date_created']->date('d/M/Y') . '; ' .

            // Parent Order ID
            '#' . ( ( $order->get_type() === 'shop_order' ) ? $order->get_id() : $order->get_parent_id() ) . '; ' .

            // Order ID
            '#' . $order->get_id()
        )
    }
}

This function is triggered on a button click…

I would like To enable something similar from admin orders list bulk selection functionality. So the selected orders by shop manager on admin orders list (see the screenshot below) will be sent to a similar custom script and then downloaded.

In that case, the selected orders would override the specified dates, if any, in the orders retrieval.

However, I can't find a variable to access that tells me which orders are selected at that moment by the admin user.

Any help will be appreciated…

Here is the complete way to make your functionality work on bulk order list action selection, instead of date range:

// Adding to admin order list bulk dropdown a custom action 'custom_downloads'
add_filter( 'bulk_actions-edit-shop_order', 'downloads_bulk_actions_edit_product', 20, 1 );
function downloads_bulk_actions_edit_product( $actions ) {
    $actions['write_downloads'] = __( 'Download orders', 'woocommerce' );
    return $actions;
}

// Make the action from selected orders
add_filter( 'handle_bulk_actions-edit-shop_order', 'downloads_handle_bulk_action_edit_shop_order', 10, 3 );
function downloads_handle_bulk_action_edit_shop_order( $redirect_to, $action, $post_ids ) {
    if ( $action !== 'write_downloads' )
        return $redirect_to; // Exit

    global $attach_download_dir, $attach_download_file; // ???

    $processed_ids = array();

    foreach ( $post_ids as $post_id ) {
        $order = wc_get_order( $post_id );
        $order_data = $order->get_data();

        // Your code to be executed on each selected order
        fwrite($myfile,
            $order_data['date_created']->date('d/M/Y') . '; ' .
            '#' . ( ( $order->get_type() === 'shop_order' ) ? $order->get_id() : $order->get_parent_id() ) . '; ' .
            '#' . $order->get_id()
        );
        $processed_ids[] = $post_id;
    }

    return $redirect_to = add_query_arg( array(
        'write_downloads' => '1',
        'processed_count' => count( $processed_ids ),
        'processed_ids' => implode( ',', $processed_ids ),
    ), $redirect_to );
}

// The results notice from bulk action on orders
add_action( 'admin_notices', 'downloads_bulk_action_admin_notice' );
function downloads_bulk_action_admin_notice() {
    if ( empty( $_REQUEST['write_downloads'] ) ) return; // Exit

    $count = intval( $_REQUEST['processed_count'] );

    printf( '<div id="message" class="updated fade"><p>' .
        _n( 'Processed %s Order for downloads.',
        'Processed %s Orders for downloads.',
        $count,
        'write_downloads'
    ) . '</p></div>', $count );
}

Code goes in function.php file of your active child theme (or active theme). Tested and works.

In the returned url I have something like (for 2 selected / processed orders): wp-admin/edit.php?post_type=shop_order&paged=1&write_downloads=1&processed_count=2&processed_ids=847%2C846

I can't test your included script but it's the way to do it on Woocommerce Orders Admin list.

VARIABLES:

The available variables are set by add_query_arg() function as you will see. When the action is triggered, you get those variables in the URL through GET method…

You can set any variable yourself too…

In this example you can use $_GET or $_REQUEST with:

$_GET['write_downloads'] (the name action: true or false)
$_GET['processed_count'] (the number of selected orders)
$_GET['processed_ids'] (the Order Ids separated by an url-encoded coma %2C)

So you can either execute your script:

inside my code function (like in my code) … or …

outside it, using the available variables once the action is triggered…

To remove a specific action from the dropdown orders bulk actions

For example we want to remove "On hold" status change:

add_filter( 'bulk_actions-edit-shop_order', 'remove_a_bulk_order_action', 20, 1 );
function remove_a_bulk_order_action( $actions ) {
    unset($actions['mark_on-hold']);

    return $actions;
}