Auto add a Product to Cart in Woocommerce 3 - php

Question

I would like that anybody who visits my Woocommerce shop finds a free product in his cart. I found this code and it works but it shows many php errors in logs.
Do you have an idea why is not "clean"?
Any help on this please.
/*
* AUTOMATICALLY ADD A PRODUCT TO CART ON VISIT
*/
function aaptc_add_product_to_cart() {
if ( ! is_admin() ) {
$product_id = 99999; // Product Id of the free product which will get added to cart
$found = false;
//check if product already in cart
if ( sizeof( WC()->cart->get_cart() ) > 0 ) {
foreach ( WC()->cart->get_cart() as $cart_item_key => $values ) {
$_product = $values['data'];
if ( $_product->get_id() == $product_id )
$found = true;
}
// if product not found, add it
if ( ! $found )
WC()->cart->add_to_cart( $product_id );
} else {
// if no products in cart, add it
WC()->cart->add_to_cart( $product_id );
}
}
}
add_action( 'init', 'aaptc_add_product_to_cart' );

Answer 1

Try instead this revisited similar code using template_redirect action hook:
add_action( 'template_redirect', 'auto_add_product_to_cart' );
function auto_add_product_to_cart() {
if ( is_admin() ) return;
// Product Id of the free product which will get added to cart;
$product_id = 99999;
if ( WC()->cart->is_empty() )
{
// No products in cart, we add it
WC()->cart->add_to_cart( $product_id );
}
else
{
$found = false;
//check if product already in cart
foreach ( WC()->cart->get_cart() as $cart_item ) {
if ( $cart_item['data']->get_id() == $product_id )
$found = true;
}
// if the product is not in cart, we add it
if ( ! $found )
WC()->cart->add_to_cart( $product_id );
}
}
Code goes in function.php file of your active child theme (or active theme). Tested and works.
Note: The init hook is not correct here and not to be used for this…