php - Woocommerce: add free product if cart has 3 items -

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what i'm trying add free product if user have 3 product in cart. choosed woocommerce_add_cart_item hook this. here code :

add_filter('woocommerce_add_cart_item', 'set_item_as_free', 99, 1);  function set_item_as_free($cart_item) {      global $woocommerce;     $products_with_price = 0;      foreach ( $woocommerce->cart->get_cart() $cart_item_key => $values ) {         if($values['data']->price == 0) {             continue;          } else {             $products_with_price++;         }     }      if( $products_with_price > 1 && $products_with_price % 3 == 1) {         $cart_item['data']->set_price(0);         return $cart_item;     }     return $cart_item;  }

i tried $cart_item['data']->price = 0; doesn't work out either :( there wrong or maybe there other way done? thanks.

try modified code: (have changed condition.)

add_filter('woocommerce_add_cart_item', 'set_item_as_free', 99, 1);  function set_item_as_free($cart_item) {      global $woocommerce;     $products_with_price = 0;      foreach ( $woocommerce->cart->get_cart() $cart_item_key => $values ) {         if($values['data']->price == 0) {             continue;          } else {             $products_with_price++;         }     }      if( $products_with_price >= 3 && $products_with_price % 3 == 1) {         $cart_item['data']->set_price(0);         return $cart_item;     }     return $cart_item;  }

if don't want add free product again after user purchases 3 products above existing cart remove " && $products_with_price % 3 == 1" last condition.


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