PHP function to increment variable by 1 each time

问题

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>

回答1:

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;
      }
   }

回答2:

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>";
 }

回答3:

You have to store 'number' in session because it will loose his value every time page submitted.

来源：https://stackoverflow.com/questions/10743807/php-function-to-increment-variable-by-1-each-time

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php

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auto-increment

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