How can I programmatically create WooCommerce product variations with new attribute values?

Create Programmatic WooCommerce Product Variations with New Attribute Values

This question addresses the challenge of creating product variations for a pre-existing variable product in WooCommerce 3 . The goal is to automate this process while also handling the creation of new attribute values for variations that do not yet exist.

Solution

The provided solution leverages a custom PHP function called create_product_variation(). This function takes two parameters:

1. $product_id: The post ID of the parent variable product.
2. $variation_data: An array containing the variation attributes, SKU, prices, and stock information.

The function begins by creating a product variation post object. This object is then used to create a new post, representing the variation. Next, an instance of the WC_Product_Variation object is created and used to set the attribute values for the variation.

The function iterates through the variation attributes provided in the $variation_data array. For each attribute, it checks if the corresponding taxonomy exists. If it doesn't, the taxonomy is created using the register_taxonomy() function.

For each attribute value specified in $variation_data['attributes'], the function checks if the term already exists. If it doesn't, it creates the term using wp_insert_term(). The term's slug is then obtained and used to update the post meta for the variation.

Additional variation data, such as SKU, prices, and stock quantity, are also set using appropriate methods. Note that when managing stock, the set_manage_stock() method must be set to true.

Finally, the variation object is saved using the save() method.

Example Usage

The provided example demonstrates how to create a product variation with two attributes ("size" and "color"), a unique SKU, prices, and stock quantity:

$parent_id = 746; // Or get the variable product id dynamically

// The variation data
$variation_data =  array(
    'attributes' => array(
        'size'  => 'M',
        'color' => 'Green',
    ),
    'sku'           => '',
    'regular_price' => '22.00',
    'sale_price'    => '',
    'stock_qty'     => 10,
);

// The function to be run
create_product_variation( $parent_id, $variation_data );

Once this code is executed, it will create a new product variation with the specified attributes, prices, and stock information.

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