PHP - Web Based Reservation System, Help !!

Hi all
 
I am building a website for a restaurant where the registered user can do booking in the booking page where user finds the booking form. my problem is I created the log in system but cannot workout with the booking page.
 
I have this scenario -
 
Customer visits site & registers details (name, email etc) on a "registration page" (creating a username & password which goes into your database) - done that
 
Next day, customer visits site and logs in on a "log in page" using the username & password from the previous day which is now stored in your database. Can now make a booking based on this log in. (cannot do this)

This topic has been moved to Third Party PHP Scripts.

http://www.phpfreaks.com/forums/index.php?topic=358615.0

Hi guys. I have a problem in my web based examanation system written in php.

Here's the scenario:

when a user takes an exam. 1 question is displayed 1 at a time. my problem is if he/she is at the 2nd question then he/she pressed the back button he/she is redirected back to the 1st question and my system just go crazy. How can i prevent the user from pressing the back button or returning to the previous questions? Please I really need help on this. Can anyone give me suggestion for possible solutions on my problem?

Thanks in advance

by the way here's my code, you can also download it from attachment.

------------------------------------------process_exam.php------------------------------------------------------------

<?php
   
   //start session
   session_start();

   //declare variables
   //iCorrect= variable for score
   $_SESSION['iCorrect']=0;

   //a=variable for iteration kang index kang mga array or serves as an current item number
   $_SESSION['a']=1;

   //connect to database
   include('mysql_connect.php');

   $result = mysql_query("select * from questions where exam_id ='$_SESSION[exam_id]'");
   
   //count the number of found questions
   $_SESSION['num_of_questions']=mysql_num_rows($result);
   
   //declare the iterator
   $i=1;
   
   //get the options for the question1,question2 and so on and so on. depende kung ilang questions ang mafetch nya sa dbase.so pde kht ilang questions lagay ng user
   while ($row = mysql_fetch_assoc($result))
   {
      $questions[$i] = $row['question'];
      $op1[$i] = $row['op1'];
      $op2[$i] = $row['op2'];
      $op3[$i] = $row['op3'];
      $op4[$i] = $row['op4'];
      $answers[$i]=$row['answer'];
      $i++;
   }

   //view the data's in the array for debugging purposes
   echo 'answers: ';
   print_r($questions);
   echo '<br>';
   print_r($op1);
   echo '<br>';
   print_r($op2);
   echo '<br>';
   print_r($op3);
   echo '<br>';
   print_r($op4);
   echo '<br>';
   print_r($answers);
   echo '<br>';
   echo '<br>';


   //pass the arrays to session arrays to be used in other php pages
    $_SESSION['question']=$questions;
    $_SESSION['op1']=$op1;
    $_SESSION['op2']=$op2;
    $_SESSION['op3']=$op3;
    $_SESSION['op4']=$op4;
    $_SESSION['answers']=$answers;
   
   //print the arrays. debugging purposes
   //1 is the starting index of the array because the $i is equal to 1
   print_r($_SESSION['question']);
   echo '<br>';
   print_r($_SESSION['op1']);
   echo '<br>';
   print_r($_SESSION['op2']);
   echo '<br>';
   print_r($_SESSION['op3']);
   echo '<br>';
   print_r($_SESSION['op4']);
   echo '<br>';
   print_r($_SESSION['answers']);
   
   
   header("location:exam.php");

?>

</body>
</html>


----------------------------------------------------------exam.php--------------------------------------------------------------------

<?php
   //start session
   session_start();
   
   
   
   echo '<br>';
   echo '<br>';
   echo '<tr>';
   echo '<b>';
   echo 'Question: ';
   echo '<td align = center>'.$_SESSION['question'][$_SESSION['a']].'</td>';
   echo '</tr>';
   
   echo '<form method = "post" action= "nxt_question.php">';
   echo '<table border = "0">';
   echo '<tr>';
   //echo '<td>';
   echo "<td><Input type =\"Radio\" Name =\"choice\" value='".$_SESSION['op1'][$_SESSION['a']]."'>";
   echo '<td>'.$_SESSION['op1'][$_SESSION['a']].'</td>';
   echo '</tr>';
   echo '<tr>';
   echo "<td><Input type =\"Radio\" Name =\"choice\" value='".$_SESSION['op2'][$_SESSION['a']]."'>";
   echo '<td>'.$_SESSION['op2'][$_SESSION['a']].'</td>';
   echo '</td>';
   echo '</tr>';
   echo "<td><Input type =\"Radio\" Name =\"choice\" value='".$_SESSION['op3'][$_SESSION['a']]."'>";   
   echo '<td>'.$_SESSION['op3'][$_SESSION['a']].'</td>';
   echo '</tr>';
   echo "<td><Input type =\"Radio\" Name =\"choice\" value='".$_SESSION['op4'][$_SESSION['a']]."'>";
   echo '<td>'.$_SESSION['op4'][$_SESSION['a']].'</td>';
   echo '</tr>';
   echo '</table>';
   echo '<tr>
   <td>
   <input type = "submit" value="Next Question">
   </td>
   </tr>';
   echo '</form>';
   
   ?>

----------------------------------------------nxt_question.php-------------------------------------

<?php

   //start session
   session_start();

   //Checking of answers kada mag pindot next question button
   if(isset($_POST['choice']))
   {
      $ans_of_user=$_POST['choice'];
      $_SESSION['answers'][$_SESSION['a']];
      
      if (strcmp($ans_of_user,$_SESSION['answers'][$_SESSION['a']])==0)
         {
            $_SESSION["iCorrect"]++;
         }
   }

   //add 1 to the session a. session a is the iterator. serves as indexes of the arrays that stores the questions,answers etc...
   $_SESSION['a']++;
   
   //ridirect to exam.php if there are still number of items remaining.
   while($_SESSION['a']<=$_SESSION['num_of_questions'])
   {
      header("location:exam.php");
      
      exit();  //kill the script
   }
   
   echo 'exam finished!';
   echo '<br>';
   echo 'Your score is: ';
   echo $_SESSION["iCorrect"];
   
   //unset the session variables needed to be reset
   unset($_SESSION["iCorrect"]);
   unset($_SESSION["exam_id"]);
   unset($_SESSION["invitation_code"]);
   unset($_SESSION["a"]);
   unset($_SESSION["num_of_questions"]);
   unset($_SESSION["question"]);
   unset($_SESSION["op1"]);
   unset($_SESSION["op2"]);
   unset($_SESSION["op3"]);
   unset($_SESSION["op4"]);
   unset($_SESSION["answers"]);
   
?>

Hi, i am thinking of creating a text based game mmorpg using php/mysql etc... I know that a lot of these types of games use a tick based system, but i want it to be realtime, the only game i cna find that uses this is Torn, does anyone know how they make it realtime? I know that ticks can be controlled by cronjobs, but how about realtime?

The problem is that the game might involve the player building a house, in a tick based system it could be easy to manage by saying the house will take 3 ticks to complete, but i want the house to be like in 10 minutes of 32 minutes, how can i do this. Someone said to check whenever the player next logs in to check if the house has finished and then say it has been built, but seeing as it is an mmorpg it could affect everyones gameplay, not just the person building it, so this will not work.

Thanks and sorry if this is a bit confusing.

Hello everyone, and thanks in advance for trying to help me.

I'm an IT student in Rotterdam, and I've got a little problem here. It's probably basic to most of you guys, but I've only been working with php for the past 3 months or so.

I'm making a website for some company, and they want a reservation system. I've created everything so far, except for the fact that you can actually double book. Can you guys tell me how to make sure you can't book a reservation when that time is used by another reservation? Preferably even, when making the reservation, the reserved times aren't even chooseable.

In my database I have the current info:

table: reservations

id (PK, UQ, A_I)
date (date)
starting time (time example: 09:00:00)
ending time (time example: 10:00:00)
~Some other random information needed by that company~

Now it doesn't need to come to minutes or seconds, you can only reserve for whole hours, from and untill the hour.

I made the script that puts everything in the database and everything, I just need a little script on how to check if the time on the date you selected earlier (it's like a step system, step 1 select date, step 2 select time, step 3 fill in other random info) is already reserved, and to make sure the reserved times don't appear into the dropdown menu for the times.

I hope you guys can help me.