troubleshooting Question

How do I do a correct check?

Avatar of Lennart Ericson
Lennart EricsonFlag for Sweden asked on
Web DevelopmentPHPMySQL Server
14 Comments1 Solution363 ViewsLast Modified:
Experts and Gurus, I am making a booking application for a small parking place. It has five places. Customers can book one car for one 24-hour period up to seven 24-hour periods.
Apart from registering the name, register plate information etc pertaining to the parker, I have a data base table like this:

id , parking_space_nr, arrival_day, departure_day, arrival_code, departure_code, reference_nr, 24_hrs_periods

Arrival_code and departure_code is UNIX time for arrival_day and departure_day respectively.

There is a grace period built in:
$code_of_arrival = strtotime($_POST['day_of_arrival']) + 46800;
$code_of_departure = ($code_of_arrival + ($_POST['24_hrs_periods'] * 86400) - 3600);

If I need to join the two data base tables it is done on reference_nr.

I have tried to construct a piece of code to find out whether a certain parking_space_nr is free or not the day a customer wants to book:
$SQL = "SELECT * FROM platser WHERE arrival_code between '$code_of_arrival' AND '$code_of_departure' AND parking_space_nr = '1' ";
$ret = mysql_query($SQL);
if (!$ret) { echo("[0] ".mysql_error()); }
else {
$number_of_bookings = mysql_num_rows($ret);
if($number_of_bookings > 0) {  the particular parking_space_nr is not free and a parking prohibited sign is shown for that parking_space_nr }
else  { a parking allowed sign is shown  }

I would like to ask you gurus and experts how to construct the piece of code to correctly find out whether the parking space is free or not.
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