For use if else check the availability

[yuttakarn]

Customers pick When finished If on the book, such as the selection of Van Dyke VT01 from 1/07/59 - 2/07/59-day period, you will not be able to book your car again. It is based on the availability of the vehicle.

I made a separate table Storage booking Van table separately too.

Tables, storage, booked by id_car I take from the table and put the van.

Table of van

This is the code that I defined it booked only three people per day.

$date = "$rn_gostart"; //กำหนดค้นวันที่  
$result = mysqli_query($mysqli,"select * from vn_rent where rn_gostart = '$date'");  
$ckd = mysqli_num_rows($result);  
if($ckd >= 3){  
$msg = "<div class='alert alert-danger'>  
<span class='glyphicon glyphicon-info-sign'></span>   วันที่จองเต็มแล้ว  
</div>";  
}else{ 

Sorry I am not good at English Please help me

[justsomeguy]

When someone selects the dates you need to look up in the database to see if the vehicle is already booked during any of those times.