Manipulate woocommerc price in cart - php

Question

I try to manipulate the calculated price in cart but with no luck...
I hope someone can help me here.
I have found this article and implemented the code as written on the Page which is to 98% exactly what i searched for. I need to add a cart calculation if the price type is per 100g.
So this is the actual working code:
add_filter( 'woocommerce_get_price_html', 'wb_change_product_html', 10, 2 );
// Adding a custom field to the price markup
function wb_change_product_html( $price, $product ) {
//$wb_price_type = get_field('product_price_type');
$wb_price_type = get_post_meta( $product->get_id(), 'product_price_type', true);
if($wb_price_type) {
$price_html = '<span class="amount">' . $price . ' ' . $wb_price_type . '</span>';
}
else {
$price_html = '<span class="amount">' . $price . '</span>';
}
return $price_html;
}
add_filter( 'woocommerce_cart_item_price', 'wb_change_product_price_cart', 10, 3 );
// Adding a custom field to the price in the cart
function wb_change_product_price_cart( $price, $cart_item, $cart_item_key ) {
//$wb_price_type = get_field( 'product_price_type', $cart_item['product_id'] );
$wb_price_type = get_post_meta( $cart_item['product_id'], 'product_price_type', true );
if ($wb_price_type) {
$price = $price . ' ' . $wb_price_type;
}
else {
$price = $price;
}
return $price;
}
add_filter( 'woocommerce_checkout_cart_item_quantity', 'wb_checkout_review', 10, 3 );
// Adding a custom field to the price in the checkout items
function wb_checkout_review ( $quantity, $cart_item, $cart_item_key ) {
//$wb_price_type = get_field( 'product_price_type', $cart_item['product_id'] );
$wb_price_type = get_post_meta( $cart_item['product_id'], 'product_price_type', true);
if ( $wb_price_type ) {
$cart_item = ' ' . sprintf( '× %s ', $cart_item['quantity'] ) . $wb_price_type . '';
}
else {
$cart_item = ' ' . sprintf( '× %s', $cart_item['quantity'] ) . '';
}
return $cart_item;
}
Well i thought its really easy to calculate so i do something like this:
add_filter( 'woocommerce_cart_item_price', 'wb_change_product_price_cart', 10, 3 );
// Adding a custom field to the price in the cart
function wb_change_product_price_cart( $price, $cart_item, $cart_item_key ) {
//$wb_price_type = get_field( 'product_price_type', $cart_item['product_id'] );
$wb_price_type = get_post_meta( $cart_item['product_id'], 'product_price_type', true );
if ($wb_price_type) {
if ($wb_price_type == "per 100g") {
$price = $price / 100 . ' ' . $wb_price_type;
}
else {
$price = $price . ' ' . $wb_price_type;
}
}
else {
$price = $price;
}
return $price;
}
But this didnt work... i too try to manipulate the price directly but i get anytime 0 in the value of the price...
so i google a little bit more and found this article, which makes in the end exactly what i want. in the last print screen we can see that the price will displayed per kg (which is completely fine) and in the calculation it uses an other price (which i try to do with the code above).
i think that the problem is that $price has for example the value "20$" and this is a string and i cannot calculate withe a string. And it makes no sense to split this string there should be an other way.
For better understanding here a picture. in the upper part we see the working calculation (which is good) but this is not exactly what i need. in the part down we see that it will only calculate on the calculated price (right side). the left side of the downer part remain with the correct price.

Answer 1

i think that the problem is that $price has for example the value "20$" and this is a string and i cannot calculate withe a string. And it makes no sense to split this string there should be an other way.
This is true, it's actually a full html string. Try changing the woocommerce_cart_item_price filter to get the price out of string:
add_filter('woocommerce_cart_item_price', 'wb_change_product_price_cart', 10, 3);
// Adding a custom field to the price in the cart
function wb_change_product_price_cart($price, $cart_item, $cart_item_key)
{
$wb_price_type = get_post_meta($cart_item['product_id'], 'product_price_type', true);
if ($wb_price_type) {
if ($wb_price_type == "per 100g") {
preg_match("/([0-9]+\.[0-9]+)/", $price, $matches);
$_price = $matches[0];
$per100 = $_price / 100;
$price = $per100 . ' ' . $wb_price_type;
} else {
$price = $price . ' ' . $wb_price_type;
}
} else {
$price = $price;
}
return $price;
}