How to make the Html dropdown list selected value to be printed as a CSV?

I have this html code and I want when I select name from table category with export.php to export all the data only for this category name.Can you help me please?

     
        <select>
            <option disabled selected></option>
            <?php
            include "config.php";  // 
            $products_cat = mysqli_query($con, "SELECT name From category");  

            while ($product_categoty = mysqli_fetch_array($products_cat)) {
                echo "<option value='" . $product_categoty['name'] . "'>" . $product_categoty['name'] . "</option>"; 
            }
            ?>
        </select>
        <form method="post" action="export.php">
            <input type="submit" name="expo" value="Export Category">
        </form>
    </form>```

Answer

I think Select should be inside the form and please follow these steps to export data as csv. https://www.codexworld.com/export-data-to-csv-file-using-php-mysql/