Добавление в SQL запрос данных из Combobox

<form>
        <?php 
        $data = getPosts2();    
        $search_Query2="SELECT number FROM cars WHERE owner_id = '$data[1]'";
        $search_Result2 = mysqli_query($connect,$search_Query2); 
        
        echo "<select name='find2'>";
        
        if(mysqli_num_rows($search_Result2)>0)
            {
        while($row2 = mysqli_fetch_array($search_Result2)) 
                {
        
            echo "<option value='" . $row2['number'] . "'>" . $row2['number'] ."</option>"; 
                }
            }
            echo "</select>";
        ?>
        <input type="submit" name="find2" value="Показать"></p>
    </form>

$search_Query3 = "SELECT * FROM cars WHERE `number` = '$row2['number']'" ;
    $search_Result3 = mysqli_query($connect, $search_Query3);
    if($search_Result3)
        if(mysqli_num_rows($search_Result3))
        {
            while($row = mysqli_fetch_array($search_Result3))
            {
                
                $car_id = $row['car_id'];
                $time_period = $row['time_period'];
        $cost = $row ['cost'];
            }
        }

  $search_Query3 = "SELECT * FROM cars WHERE `number` = '$_POST[number]'" ;