Get the total stock of all variations from a variable product In Woocommerce

Question

IN woocommerce I would like to display the total stock of all variations in a variable product. The stock of each product variation is managed at the product variation level

Answer 1

The following custom function will displays the sum of all product variations stock quantity for a variable product (only).

It use a very light SQL query that make the sum of all children variations from a variable product.

Note: The stock need to be managed at product variation level.

function wc_get_variable_product_stock_quantity( $output = 'raw', $product_id = 0 ){
    global $wpdb, $product;

    // Get the product ID (can be defined)
    $product_id = $product_id > 0 ? $product_id : get_the_id();

    // Check and get the instance of the WC_Product Object
    $product = is_a( $product, 'WC_Product' ) ? $product : wc_get_product($product_id);

    // Only for variable product type
    if( $product->is_type('variable') ){

        // Get the stock quantity sum of all product variations (children)
        $stock_quantity = $wpdb->get_var("
            SELECT SUM(pm.meta_value)
            FROM {$wpdb->prefix}posts as p
            JOIN {$wpdb->prefix}postmeta as pm ON p.ID = pm.post_id
            WHERE p.post_type = 'product_variation'
            AND p.post_status = 'publish'
            AND p.post_parent = '$product_id'
            AND pm.meta_key = '_stock'
            AND pm.meta_value IS NOT NULL
        ");

        // Preparing formatted output
        if ( $stock_quantity > 0 ) {
            $html = '
'. sprintf( __("%s in stock", "woocommerce"), $stock_quantity ).'
';
        } else {
            if ( is_numeric($stock_quantity) )
                $html = '
' . __("Out of stock", "woocommerce") . '
';
            else
                $html = '';
        }

        // Different output options
        if( $output == 'echo_html' )
            echo $html;
        elseif( $output == 'return_html' )
            return $html;
        else
            return $stock_quantity;
    }
}

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

---

USAGE (3 cases):

1) Anywhere in php code, get the stock quantity (from a dynamic $product_id):

$stock_quantity = wc_get_variable_product_stock_quantity( 'raw', $product_id );

---

2) Display in shop and archives pages (Under the price range example):

add_action( 'woocommerce_after_shop_loop_item_title', 'display_variable_product_stock_quantity', 20 );
function display_variable_product_stock_quantity(){
    wc_get_variable_product_stock_quantity( 'echo_html' );
}

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

---

3) Display in single product pages (Under the price range example):

add_action( 'woocommerce_single_product_summary', 'display_variable_product_stock_quantity', 15 );
function display_variable_product_stock_quantity(){
    wc_get_variable_product_stock_quantity( 'echo_html' );
}

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