PHP function to increment variable by 1 each time

Asked 24/5, 2012 at 19:8 Answered 19/1, 2016 at 5:5

Solved php function auto-increment decision-tree expert-system

I have started writing a PHP script for a game about creatures, there are 4 yes/no questions and what I am trying to do is write a function that will display 2 buttons that say yes and no and give then different names each time I run the function, for example yes1 and no1, then the next time the function is run the names of the buttons will be yes2 and no2.

I have attempted to do this already but it is not working correctly, below is the code I have done so far, any help would be much appreciated.

<?php
session_set_cookie_params(2592000);
session_start();
?>

<html>
<head>
<title>Creature Guessing Game</title>
</head>
<body>
<h1>Creature Guessing Game</h1>
<p> Welcome to the creature guessing game! </p>
<p>Click the button below to start or restart the game </p>

<form method="post" action="Creatures.php">
<input type="submit" name="start" value="Start Game" />
</form>
 <?php
 $questions = array('Does the creature live on land?', 'Does it have wings?', 'Does it live near water?', 'Can it fly?');
 function repeat()
 {
 $number = 0;
 $number++;
 echo "<form method ='post' action='Creatures.php'>
<input type='submit' name='yes'.$number value='Yes' />
<input type='submit' name='no'.$number value='No' />
</form>";

 }
//If form not submitted, display form.
if (!isset($_POST['start'])){
?>
<?php
} //If form is submitted, process input
else{ 
switch($_POST)
{
case yes1:
echo $questions[0];
repeat();
break;
case no1:
echo $questions[1];
repeat();
break;
case yes2:
echo $questions[2];
repeat();
break;
case no2:
$questions[3];
repeat();
}
}
?>
</body>
</html>

Papeterie answered 24/5, 2012 at 19:8 Comment(2)

Each time you call repeat() you're setting $number to 0 and then incrementing it. What if you set $number after you set $questions but before repeat() is defined? – Gavotte 24/5, 2012 at 19:11

I have just tried that but then for some reason $number is always set to 0 as I tried echoing it and no matter how many times I called the function $number remained 0 – Papeterie 24/5, 2012 at 19:17

To do this you need to maintain state between requests.

 function repeat() {
      $number = $_SESSION['number'];
      $number++;
      echo "<form method ='post' action='Creatures.php'>
     <input type='submit' name='answer' value='Yes' />
     <input type='submit' name='answer' value='No' />
     </form>";
     $_SESSION['number'] = $number;
 }

switch

   if($_POST['answer']=='Yes') {
      switch($_SESSION['number']) {
            case 1:
            break;
            case 2:
            break;
      }
   } else {
      switch($_SESSION['number']) {
            case 1:
            break;
            case 2:
            break;
      }
   }

Bowhead answered 24/5, 2012 at 19:40 Comment(2)

Thank you! The function is working like I wanted it to now, the switch statement is still not working but I might just try something instead of a switch now. – Papeterie 24/5, 2012 at 20:10

This still doesn't work, I want the switch statement to do different things depending on what button is pressed (either yes or no), maybe there is some way to make the switch condition yes1 and make the first case so if its true (i.e. $_POST = 'yes1') and the second case if it's not true. Don't know if you understand?? If you do is this possible? – Papeterie 24/5, 2012 at 20:46

I am not in agreement with the accepted answer: Here is an easier way to go about it without session:

function repeat() {
      static $number = 0;
      $number++;
      echo "<form method ='post' action='Creatures.php'>
     <input type='submit' name='answer' value='Yes' />
     <input type='submit' name='answer' value='No' />
     </form>";
 }

Justiciar answered 19/1, 2016 at 5:5 Comment(0)

You have to store the 'number' in session or cookie as it will loose the value every time page submitted (reloaded).

Natty answered 24/5, 2012 at 19:37 Comment(0)

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