<header class="header">
<div class="flex">
<a href="#" class="logo">foodies</a>
<nav class="navbar">
<a href="admin.php">add products</a>
<a href="products.php">view products</a>
</nav>
<?php
$select_rows = mysqli_query($conn, "SELECT * FROM `cart`") or die('query failed');
$row_count = mysqli_num_rows($select_rows);
?>
<a href="cart.php" class="cart">cart <span><?php echo $row_count; ?></span> </a>
<div id="menu-btn" class="fas fa-bars"></div>
</div>
</header>