Change product prices via a hook in WooCommerce 3

Question

IN WooCommerce, I need to multiply all product prices by a number. So I have used the following (via a plugin):

add_filter('woocommerce_get_regular_price', array( $this, 'my_custom_price'), 99);
add_filter('woocommerce_get_price', array( $this, 'my_custom_price'), 99);

function my_custom_price( $original_price ) {
  global $post, $woocommerce;

  //Logic for calculating the new price here
  $new_price = $original_price * 2;

  //Return the new price (this is the price that will be used everywhere in the store)
  return $new_price;
 }

But, that doesn't work for variation products. I have tried the following hooks with no luck:

add_filter('woocommerce_get_variation_regular_price', array( $this, 'my_custom_price'), 99);
add_filter('woocommerce_get_variation_price', array( $this, 'my_custom_price'), 99);

The only one that works half way is this one:

add_filter('woocommerce_variation_prices_price', array( $this, 'my_custom_price'), 99);

But that just changed the overall price, not the selected variation price. See the image below, price is BsF. 200 and the overall price is right, 200 x 2 = 400, but the variation price when selected still shows 200:

Note: I need it to actually change, so display html hooks wont work.

Is there anything I'm missing, or something wrong?

Answer 1

excuse my English, I do not know much ... I am implementing this code, but in my case what I need is to divide the price of the product in 12 installments .. This works in both variable and simple products .. However the mini cart, cart page and checkout is as if it were returning to divide the price into 12.. This is the code that I am adding.

function get_price_divider() {
    return 12;
}

// Simple, grouped and external products
add_filter('woocommerce_product_get_price', 'custom_price', 99, 2 );
add_filter('woocommerce_product_get_regular_price', 'custom_price', 99, 2 );
// Variations
add_filter('woocommerce_product_variation_get_regular_price', 'custom_price', 99, 2 );
add_filter('woocommerce_product_variation_get_price', 'custom_price', 99, 2 );
function custom_price( $price, $product ) {

    return $price / get_price_divider();

}

// Variable (price range)
add_filter('woocommerce_variation_prices_price', 'custom_variable_price', 99, 3 );
add_filter('woocommerce_variation_prices_regular_price', 'custom_variable_price', 99, 3 );
function custom_variable_price( $price, $variation, $product ) {

    return $price / get_price_divider();

}

// Handling price caching (see explanations at the end)
add_filter( 'woocommerce_get_variation_prices_hash', 'add_price_multiplier_to_variation_prices_hash', 99, 1 );
function add_price_multiplier_to_variation_prices_hash( $hash ) {
    $hash[] = get_price_divider();
    return $hash;
}



add_filter( 'woocommerce_get_price_html', 'price_prefix', 100, 2 );

function price_prefix( $price, $product ){  

    $price = '12 cuotas de ' . $price;

    return apply_filters( 'woocommerce_get_price', $price );
}

Answer 2

Update 3 (September 2018)

• 2 code versions for themes and plugins (works in Woocommerce 3.3.x too)
  
• Cached variations prices in Woocommerce 3 (Update and addition):
  Now using woocommerce_get_variation_prices_hash filter hook much more efficient, instead of wc_delete_product_transients()… See this related thread

1) Plugin version with a constructor function:

The hooks that you are using are deprecated in WooCommerce 3+

To make it work for all products prices, including variations prices, you should use this:

## The following goes inside the constructor ##

// Simple, grouped and external products
add_filter('woocommerce_product_get_price', array( $this, 'custom_price' ), 99, 2 );
add_filter('woocommerce_product_get_regular_price', array( $this, 'custom_price' ), 99, 2 );
// Variations 
add_filter('woocommerce_product_variation_get_regular_price', array( $this, 'custom_price' ), 99, 2 );
add_filter('woocommerce_product_variation_get_price', array( $this, 'custom_price' ), 99, 2 );

// Variable (price range)
add_filter('woocommerce_variation_prices_price', array( $this, 'custom_variable_price' ), 99, 3 );
add_filter('woocommerce_variation_prices_regular_price', array( $this, 'custom_variable_price' ), 99, 3 );

// Handling price caching (see explanations at the end)
add_filter( 'woocommerce_get_variation_prices_hash', array( $this, 'add_price_multiplier_to_variation_prices_hash' ), 99, 1 );


## This goes outside the constructor ##

// Utility function to change the prices with a multiplier (number)
public function get_price_multiplier() {
    return 2; // x2 for testing
}

public function custom_price( $price, $product ) {
    return $price * get_price_multiplier();
}

public function custom_variable_price( $price, $variation, $product ) {
    return $price * get_price_multiplier();
}

public function add_price_multiplier_to_variation_prices_hash( $hash ) {
    $hash[] = get_price_multiplier();
    return $hash;
}

The code tested and perfectly works (only) in WooCommerce 3+.

---

2) For theme version: functions.php file on active child theme (or active theme):

// Utility function to change the prices with a multiplier (number)
function get_price_multiplier() {
    return 2; // x2 for testing
}

// Simple, grouped and external products
add_filter('woocommerce_product_get_price', 'custom_price', 99, 2 );
add_filter('woocommerce_product_get_regular_price', 'custom_price', 99, 2 );
// Variations
add_filter('woocommerce_product_variation_get_regular_price', 'custom_price', 99, 2 );
add_filter('woocommerce_product_variation_get_price', 'custom_price', 99, 2 );
function custom_price( $price, $product ) {
    return $price * get_price_multiplier();
}

// Variable (price range)
add_filter('woocommerce_variation_prices_price', 'custom_variable_price', 99, 3 );
add_filter('woocommerce_variation_prices_regular_price', 'custom_variable_price', 99, 3 );
function custom_variable_price( $price, $variation, $product ) {
    // Delete product cached price  (if needed)
    // wc_delete_product_transients($variation->get_id());

    return $price * get_price_multiplier();
}

// Handling price caching (see explanations at the end)
add_filter( 'woocommerce_get_variation_prices_hash', 'add_price_multiplier_to_variation_prices_hash', 99, 1 );
function add_price_multiplier_to_variation_prices_hash( $hash ) {
    $hash[] = get_price_multiplier();
    return $hash;
}

Tested and works on woocommerce 3+

---

For products in sale you have those hooks:

• woocommerce_product_get_sale_price (Simple, grouped and external products)
• woocommerce_variation_prices_sale_price (Variable products (min-max))
• woocommerce_variation_prices_sale_price (Products variations)

---

Cached prices and woocommerce 3:

The 3 filters hooks involved in variations cached prices are:

• woocommerce_variation_prices_price
• woocommerce_variation_prices_regular_price
• woocommerce_variation_prices_sale_price

Introduced in Woocommerce 3, woocommerce_get_variation_prices_hash filter hook will allow to refresh variations cached prices in a much more efficient way, without deleting related transients anytime that this hooks are executed.

So performances will stay boosted (Thanks to Matthew Clark that pointed this better way)

See: Caching and dynamic pricing – upcoming changes to the get_variation_prices method