how to fetch the value from mysql database using php code example

Example: how to fetch data from database in php

<?php
   //////neha jaiswal////
       include 'config.php';////incluude data base connection file
        $stmt = $conn->prepare('SELECT * FROM `product`');///select all data from database
        $stmt->execute();////query execute ($stmt)
        $result = $stmt->get_result();
        while ($row = $result->fetch_assoc()):
      ?>
         <div class="card p-2 border-secondary mb-2">
            <img src="<?= $row['product_image'] ?>" class="card-img-top" height="250">
            <div class="card-body p-1">
              <h4 class="card-title text-center text-info"><?= $row['product_name'] ?></h4>
              <h5 class="card-text text-center text-danger"><i class="fas fa-rupee-sign"></i><?= number_format($row['product_price'],2) ?>/-</h5>