Change Shipping total in woocommerce Programmatically [duplicate] - php

Question

I currently charge a flat fee for shipping using the default WooCommerce shipping setup. I want to offer free shipping for the entire order if the user purchases "x" products from a single category. I have some code that I put together but I need a bit of help to get it working.
// Free shipping if you purchase 12 or more from selected category
function wcs_my_free_shipping( $is_available ) {
global $woocommerce;
// HERE set your product categories in the array (can be IDs, slugs or names)
$categories = array('t-shirts');
// Initializing
$found = false;
$count = 0;
// 1st Loop: get category items count
foreach ( WC()->cart->get_cart() as $cart_item ) {
// If product categories is found
if ( has_term( $categories, 'product_cat', $cart_item['product_id'] ) ) {
$count += $cart_item['quantity'];
}
}
// get cart contents
$cart_items = $woocommerce->cart->get_cart();
// loop through the items looking for one in the eligible array
foreach ( $cart_items as $key => $item ) {
if( in_array( $item['product_id'], $eligible ) ) {
return true;
}
}
if ( $count > 11 ) {
// Apply free shipping
$shipping = 0;
}
}
add_filter( 'woocommerce_shipping_free_shipping_is_available', 'wcs_my_free_shipping', 20 );

Answer 1

The use of 2 loops is not necessary
Take into account the product quantity per product
comment with explanation added in the code
function filter_woocommerce_shipping_free_shipping_is_available( $is_available, $package, $shipping_method ) {
// Set categories
$categories = array ( 't-shirts' );
// Set minimum
$minimum = 12;
/* END settings */
// Counter
$count = 0;
// Loop through cart items
foreach( $package['contents'] as $cart_item ) {
// If product categories is found
if ( has_term( $categories, 'product_cat', $cart_item['product_id'] ) ) {
$count += $cart_item['quantity'];
}
}
// Condition
if ( $count >= $minimum ) {
$notice = __( 'free shipping', 'woocommerce' );
$is_available = true;
} else {
$notice = __( 'NO free shipping', 'woocommerce' );
$is_available = false;
}
// Display notice
if ( isset( $notice ) ) {
wc_add_notice( $notice, 'notice' );
}
// Return
return $is_available;
}
add_filter( 'woocommerce_shipping_free_shipping_is_available', 'filter_woocommerce_shipping_free_shipping_is_available', 10, 3 );
Additional question: hide other shipping methods when free shipping is available
function filter_woocommerce_package_rates( $rates, $package ) {
// Set categories
$categories = array ( 't-shirts' );
// Set minimum
$minimum = 11;
/* END settings */
// Counter
$count = 0;
// Loop through line items
foreach( $package['contents'] as $line_item ) {
// Get product id
$product_id = $line_item['product_id'];
// Check for category
if ( has_term( $categories, 'product_cat', $product_id ) ) {
$count += $line_item['quantity'];
}
}
// Condition
if ( $count > $minimum ) {
// Set
$free = array();
// Loop
foreach ( $rates as $rate_id => $rate ) {
// Rate method id = free shipping
if ( $rate->method_id === 'free_shipping' ) {
$free[ $rate_id ] = $rate;
break;
}
}
}
return ! empty( $free ) ? $free : $rates;
}
add_filter( 'woocommerce_package_rates', 'filter_woocommerce_package_rates', 10, 2 );
Based on:
How to disable shipping method based on item count and a certain category
WooCommerce - Hide other shipping methods when FREE SHIPPING is available