I ended up fixing this myself. I tried Paul de Koning's answer. Changing to apply_filters caused the prices to go to $0. I think this is because the order they need to go in.
Here was my solution. The root cause was that I was using the change price_html function to provide the change prices for the cart. Inside that function there were add_action calls etc. Somehow, there must have been an ordering issue. This is a multi step process to ensure all areas are done correctly.
If you want to change woocommerce prices without using sessions to store the changed price for the cart while changing the display price and hiding prices, perform something like the following:
functions.php
add_action('woocommerce_get_price_html','special_price');
function special_price($price) {
//put any if statements for hiding the cart button and discounting pricing below and return true or false
$displayprice = true;
$alterprice = true;
if($displayprice === true) {
add_action( 'woocommerce_after_shop_loop_item', 'woocommerce_template_loop_add_to_cart', 10, 2);
add_action( 'init', 'woocommerce_add_to_cart_action', 10);
add_action( 'init', 'woocommerce_checkout_action', 10 );
} else {
remove_action( 'woocommerce_after_shop_loop_item', 'woocommerce_template_loop_add_to_cart', 10, 2);
remove_action( 'woocommerce_before_add_to_cart_form', 'woocommerce_template_single_product_add_to_cart', 10, 2); //
remove_action( 'woocommerce_single_product_summary', 'woocommerce_template_single_price', 10 );
remove_action( 'woocommerce_single_product_summary', 'woocommerce_template_single_add_to_cart', 30 );
//return blank or something like 'Signup to view price'
return '';
}
//if you are displaying the price (altered)
if($displayprice === true && $alterprice === true){
$price = price_manipulator($theid);
return $price;
//display add to cart and price
}
//if you are displaying the price (unaltered)
return $price
}
function price_manipulator($theid = '') {
if(empty($theid)){
$theid = get_the_ID();
}
$product = wc_get_product($theid);
//30% off example
$newprice = floatval($product->price * (1-0.3));
return $newprice;
}
/*version of pricing if you are adding something to cart*/
function special_price_cart($theid){
$price = price_manipulator($theid);
return $price;
}
add_action( 'woocommerce_before_calculate_totals', 'woo_add_discount');
add_action( 'woocommerce_before_mini_cart', 'woo_add_discount'); //this is if you are using the mini-cart woocommerce widget
function woo_add_discount() {
global $woocommerce;
//create if statements same as if you were displaying the price
$displayprice = true;
if($displayprice === true){
foreach ( WC()->cart->get_cart() as $cart_item_key => $cart_item ) {
$price = special_price_cart($cart_item['data']->id);
$price = str_replace('$','',$price);
$price = str_replace(',','',$price);
if($price > 0){
$cart_item['data']->price = floatval($price);
}
}
}
}
