Pick Up and Drop Dates not working correctly - php

Question

so im currently working on a car rental and so far i have made reservations for certain cars.
Now what im trying to do is whenever someone searches for an available car , the cars that are not taken on these dates should show up .
I have stored pickup date and drop date on reservation table on database.
Car Database Start and End Rental Dates : https://i.stack.imgur.com/9mLTt.png
Car Showing when its not suppost to
https://i.stack.imgur.com/OiNRj.png
https://i.stack.imgur.com/5KMxP.png
Cars showing correctly https://i.stack.imgur.com/67oc6.png
So in other words if you are not able to get whats wrong i will try to make it as clear as possible.
I have 4 dates which are named as below
DB - StartDate = '2023-02-06'DB - EndDate = '2023-02-08'
DB - Selected_car = '12' is the car ID Then we have
StartDate = '2023-02-06' - This is the date inputed by the client
EndDate = '2023-02-07' - As Show in the images above
This search query would put the car as available which should not because the car is taken from date 06 till 08 also if you search till 09 as end date , the car shows available which should not because starting date is 06 and end is 08 which means the car is taken in these dates. Below you'll find the code i did for the search.php
<?php
if(isset($_POST['submit']))
{
$startDate = $_POST['pickupDate'];
$returnDate = $_POST['returnDate'];
$startDate = new DateTime($startDate);
$returnDate = new DateTime($returnDate);
$startDate = $startDate->format("Y-m-d ");
$returnDate = $returnDate->format("Y-m-d ");
if(empty($startDate))
{
$_SESSION['ErrorMessage'] = "Pickup Date can't be empty";
TakeTo("index.php");
}
elseif(empty($returnDate))
{
$_SESSION['ErrorMessage'] = "Return Date can't be empty";
TakeTo("index.php");
}
elseif($startDate == $returnDate)
{
$_SESSION['ErrorMessage'] = "Cars can only be rented for 1 or more days";
TakeTo("index.php");
}
elseif($returnDate <= $startDate)
{
$_SESSION['ErrorMessage'] = "Return date cannot be before Pickup Date";
TakeTo("index.php");
}
echo "<h3 class='text-center mt-2 bg-light'>Pickup Date : $startDate & Return Date : $returnDate <br> </h3>";
$carIDArray = array();
$data = [
'dateStart' => $startDate,
'dateEnd'=> $returnDate,
];
$sql = "SELECT
reservations.selected_car
FROM
reservations
WHERE
reservations.start_date >= :dateStart
AND
reservations.end_date <= :dateEnd
GROUP BY
reservations.selected_car"
;
$stmt = $con->prepare($sql);
$execute=$stmt->execute($data);
if($execute)
{
$results = $stmt->rowcount();
if($results >= 1)
{
while($resInfo = $stmt->fetch())
{
$carID = $resInfo['selected_car'];
$carIDArray[] = $carID;
}
$carIds = implode(",", $carIDArray);
$sql2 = "SELECT
cars.*
FROM
cars
WHERE
!FIND_IN_SET(cars.id,'$carIds') ORDER BY id DESC";
$stmt2 = $con->query($sql2);
while($carInfo = $stmt2->fetch())
{
$AllIds = $carInfo['id'];
$carName = $carInfo['car_name'];
$carEngine = $carInfo['engine'];
$carYear = $carInfo['production_year'];
$carSpend = $carInfo['100km'];
$carCapacity = $carInfo['full_tank'];
$carDoors = $carInfo['doors'];
$carImage = $carInfo['picture'];
$carTransmition = $carInfo['transmition'];
$carPrice = $carInfo['dailyprice'];
$carPetrol = $carInfo['fuel_type'];
?>
<!--Cars Display All-->
<div class="container mt-3">
<div class="container-fluid">
<div class="card mb-3 all-cars">
<div class="row g-0">
<div class="col-md-4 col-sm-6">
<img height="250" width="100%" src="carimages/<?php echo $carImage; ?>" class="rounded-star" alt="...">
</div>
<div class="col-md-8">
<div class="card-body">
<h3><?php echo $carName; ?></h3>
<hr class="bg-black">
<div class="d-block">
<table>
<tbody>
<tr>
<td> <span class="m-3 bold-text"><i class="fa-solid fa-gear"></i> <?php echo $carTransmition; ?> </span></td>
<td> <span class="m-3 bold-text"><i class="fa-solid fa-car-side"></i> <?php echo $carDoors; ?> Doors</span></td>
<td> <span class="m-3 bold-text"><i class="fa-solid fa-gas-pump"></i> <?php echo $carSpend; ?>L/100km </span></td>
</tr>
<tr><td><br></td></tr>
<tr>
<td> <span class="m-3 bold-text "><i class="fa-solid fa-calendar-day"></i> <?php echo $carYear; ?></span></td>
<td> <span class="m-3 bold-text"><i class="fa-solid fa-gas-pump"></i> <?php echo $carCapacity; ?>L </span></td>
<td> <span class="m-3 bold-text"><i class="fa-solid fa-gas-pump"></i> <?php echo $carPetrol; ?> </span></td>
</tr>
</tbody>
</table>
<h5 class="text-end top-50 m-3 bold-text"><strong ><?php echo $carPrice; ?>€</strong>/day</h5>
Choose
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<?php
}
}
else