Check if multiple categories is in the cart

functions.php

<?php
// =========================================================================
// CHECK IF THERE IS MULTIPLE CATEGORY IN THE CART
// =========================================================================
function custom_msg_to_specific_cats(){
    
    $flower_in_cart = false;
    $gift_in_cart = false;
  
    // Flower - Loop through all products in the Cart
    foreach ( WC()->cart->get_cart() as $cart_item_key => $cart_item ) {
  
       if ( has_term( 'flower-delivery', 'product_cat', $cart_item['product_id'] ) ) {
          $flower_in_cart = true;
          break;
       }
    }

    // Gift - Loop through all products in the Cart
    foreach ( WC()->cart->get_cart() as $cart_item_key => $cart_item ) {
  
        if ( has_term( 'gift', 'product_cat', $cart_item['product_id'] ) ) {
           $gift_in_cart = true;
           break;
        }
     }

    // If both condition are true
    if ( $flower_in_cart && $gift_in_cart) {
  
       echo 'There are flower and gift categories in the cart'
  
    } 
 }
 add_action('woocommerce_before_cart','custom_msg_to_specific_cats');