PHP Forum

**silverglade** · 07-17-2010, 12:42 AM

hi, im trying to use session variables to hold the dragon/player hit points. but they keep getting reset to 100 on each page load and only go down to 80 each time. any help greatly appreciated. (i couldnt figure out what to do with the globals. lol)

Code:

<?php

//The objects


 //store session data
  session_start(); 
$_SESSION["playerHp"] = 100;
 
$_SESSION["dragonHp"] = 100;

define('PLAYER_NAME','Derek');//constant unchanging name of player
  

global $playerDmg;
global $dragonDmg;
global $dragonHit;
global $playerHit;
global $dragonSlain;
global $playerSlain;
global $dragonMiss;
global $playerRoll;
global $dragonRoll;
global $playerMiss;
global $dragonMiss;
global $gameOver;

$playerDmg=20;
$dragonDmg=20;//default damage for player and dragon


//echo '<pre>'. print_r($_POST, 1).'</pre>';

 if(!empty($_POST['playerAttack']))//if player attack button pressed do the following
 {           $warrior= "<img src='images/warrior_t.jpg'/><br /><br />";
             $playerRoll=rand(1,20); //roll for the player's turn  
             $echoPlayerRoll= "<br /> player roll ".$playerRoll."<br />";
             if($playerRoll >= 11)
                 {  
                     $dragonHit="<br/> You hit the dragon for ". $playerDmg." hit points!<br />";//hit or miss based on player roll.
                    $_SESSION["dragonHp"]=$_SESSION["dragonHp"]-$playerDmg;//subtract the damage the player did to dragon
                    $echodragonHp="<br /> dragon hp:".$_SESSION["dragonHp"]."<br />";
                 }  
                
                 
                 if($playerRoll<=10) // if low roll, you missed
                 {
                     $playerMiss= "<br /> Sorry , you missed the dragon!<br />";
                 }
                 if($_SESSION["dragonHp"]<=0)
                 {  
                     session_destroy();
                
                     echo "<img src='images/torch1_t.jpg'<br /><br />";
                    $dragonSlain="Congratulations ".PLAYER_NAME.". You have slain the dragon and won the game!";
                    
                    $gameOver='true';
                    
                    
                 }
                  
                 $playerRoll=0;//reset playerRoll
 }
 
if(!empty($_POST['dragonAttack']))
{
             $dragon= "<img src='images/dragon_t.jpg'/><br /><br />";
              $dragonRoll=rand(1, 20); //roll for the player's turn
               $echodragonRoll= "<br /> dragon roll ".$dragonRoll."<br />";
             if($dragonRoll  >= 11)//if high roll, hit
             {
                 
                  $playerHit="<br/> You have been hit by the dragon for ". $playerDmg." hit points!<br />";//hit or miss based on player roll.
                $_SESSION["playerHp"]=$_SESSION["playerHp"]-$dragonDmg;//subtract the damage the player did to dragon
                 $echoPlayerHp="<br /> Player hp:".$_SESSION["playerHp"]."<br />";     
             }
             
             if($dragonRoll <=10)
             {
               $dragonMiss="Wow the dragon missed you!<br />";
             
             }
            if($_SESSION["playerHp"]<=0)
             {  
                 session_destroy();
              
                 
                 echo "<img src='images/skull_t.jpg'/><br /><br />";
                $playerSlain="<br />Sorry ".PLAYER_NAME.". You have been slain the dragon and lost the game!<br />";
                $gameOver='true';
                 
                
             }
     
              $dragonRoll=0;//reset dragon roll
     
} 
 
 ?>
 
 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">

 
<title>Dragon</title>
</head>
<body>

<p><h2>Derek's Dragon game</h2></p>
<br />
<br />
<?php if(!empty($echoPlayerRoll))
{
echo $warrior;
echo "<table>";
echo "<tr><td>".$echoPlayerRoll."</td></tr>";
}
if(!empty($echodragonRoll))
{
    echo $dragon;
echo "<tr><td>".$echodragonRoll. "</tr></td>";
}

if(!empty($echoPlayerHp))
{
    echo"<tr><td>".$echoPlayerHp."</tr></td>";
}

if(!empty($echodragonHp))
{
    echo"<tr><td>".$echodragonHp."</tr></td>";
}
if(!empty($playerSlain))
{
    echo"<tr><td>".$playerSlain."</tr></td>";
}
if(!empty($dragonSlain))
{
    echo "<tr><td>".$dragonSlain."</tr></td>";
}
if($gameOver=='true')
{
    echo "<tr><td> Now the game is over </tr></td>";
}
?>
<?php echo "<tr><td>" ?>
<?php echo $dragonHit;?> 
<?php echo $dragonSlain;?>
<?php echo $playerHit;?>  <!-- echos out logic messages -->
<?php echo $playerSlain;?>
<?php echo $playerMiss;?>
<?php echo $dragonMiss;?>
<?php echo "</tr></td>"?>
 <?php echo "<tr><td>"?>
<form name="dereksform" method="post" action="">
<input "type="submit" name="playerAttack" value="Player attacks">
<br />
<input "type="submit" name="dragonAttack" value="dragon attacks"> 
<?php echo "</tr></td></table>"?>
</form>
 <!-- encompasses form, doesnt display form upon gameOver. -->
</body>
</html>

**mgraphic** · 07-17-2010, 02:48 PM

Try only assinging the hitpoints to the session if it's not assigned.

if (!isset($_SESSION['playerHp'])) $_SESSION['playerHp'] = 100;
if (!isset($_SESSION['dragonHp'])) $_SESSION['dragonHp'] = 100;