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Tic Tac Toe?

This is a rough copy of a tic tac toe type game we had to write once, its not pretty, but its playable how it is, and it depends heavily on sessions...
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Rating : 4.7	Views : 394
Source Code ( 154 lines )

<?
// This is a fully functional tic-tak-toe game, assuming you have session
// variables installed. Its not clean or pretty, but its one way to do it.
// By the way, the AI for the computer to pick its spot is just a random
// placement, I wrote this game for little kids, if you want to replace the
// alograthim with something complex, that can't be beat, go for it.
// Copyright 2000, Derek Young, at GS Data Design

session_register("tikboard");
session_register("tikplayers");
session_register("tikturn");
session_register("winner");

// This is what happens when they click on start over.
if ($reset) { 
   unset($tikboard); unset($tikplayers); unset($tikturn); unset($winner);
}

tophtml("Tik-Tak-Toe!");

// replace these lines to insert the X and O image you want.
// example $X="<IMG SRC="http://blabla.com/myimage.gif">";
// it will work just the way it is, just not pretty ;>

$X="<FONT SIZE="10">X</FONT>";
$O="<FONT SIZE="10">O</FONT>";
$BLANK="<FONT SIZE="10">&nbsp</FONT>"; 

function tophtml($title) {
   global $PHP_SELF;
   echo "<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" ";
   echo ""http://www.w3c.org/TR/REC-html40/loose.dtd">n";
   echo "<HTML>n<HEAD>n<TITLE>$title</TITLE>n</HEAD>n";
   echo "<BODY ALINK="0000FF" LINK="0000FF" VLINK="0000FF" ";
   echo "BGCOLOR="WHITE">n";
   echo "<FORM METHOD="POST" ACTION="" . $PHP_SELF . "">n";
}

function endhtml() {
   echo "</FORM></BODY></HTML>n"; 
}

//If no turn is decided yet, make X first
if(!$tikturn) $tikturn="X";

if(!$tikboard) {
   // Initilize Game Board
   $tikboard[1]="";
   $tikboard[2]="";
   $tikboard[3]="";
   $tikboard[4]="";
   $tikboard[5]="";
   $tikboard[6]="";
   $tikboard[7]="";
   $tikboard[8]="";
   $tikboard[9]="";
}

if(!$tikplayers) {
   //Initilize Players
   echo "How many players?n";
   echo "<INPUT TYPE="SUBMIT" NAME="tikplayers" VALUE="One">n";
   echo "<INPUT TYPE="SUBMIT" NAME="tikplayers" VALUE="Two">n";
   endhtml();
   exit();
}

function fill($space) {
   global $tikboard;
   global $PHP_SELF;
   global $winner;
   global $X,$O,$BLANK;
   
   if ($tikboard[$space]=="X") return $X;
   if ($tikboard[$space]=="O") return $O;
   if (!$tikboard[$space]) 
     if ($winner) return $BLANK;
     else
       return "<A HREF="$PHP_SELF?click=$space">".$BLANK."</A>";
}

// handles where they click
if($click && !$tikboard[$click] && !$winner) {
   $tikboard[$click]=$tikturn;
   if ($tikturn=="X") $tikturn="O"; else $tikturn="X";
   //see if we won.
   checkwinner();
   if ($tikplayers=="One" && !$winner) {
      // Play Computers Turn
      srand((double)microtime()*1000000);
      $attempt=rand(1,9);
      $stopat=$attempt;
      while ($attempt++) {
         if ($attempt==10) $attempt=1;
         if (!$tikboard[$attempt]) { $tikboard[$attempt]=$tikturn;break; }
         if ($attempt==$stopat) break;
      }
      if ($tikturn=="X") $tikturn="O"; else $tikturn="X";
      //see if he won.
      checkwinner();
   }
}

function checkwinner() {
   global $winner;
   global $tikboard;

   if (($tikboard[1]==$tikboard[2]) && ($tikboard[2]==$tikboard[3]))
       if($tikboard[1]) { $winner=$tikboard[1]; return; }

   if (($tikboard[4]==$tikboard[5]) && ($tikboard[5]==$tikboard[6]))
       if($tikboard[4]) { $winner=$tikboard[1]; return; }

   if (($tikboard[7]==$tikboard[8]) && ($tikboard[8]==$tikboard[9]))
       if($tikboard[7]) { $winner=$tikboard[1]; return; }

   if (($tikboard[1]==$tikboard[4]) && ($tikboard[4]==$tikboard[7]))
       if($tikboard[1]) { $winner=$tikboard[1]; return; }

   if (($tikboard[2]==$tikboard[5]) && ($tikboard[5]==$tikboard[8]))
       if($tikboard[2]) { $winner=$tikboard[1]; return; }

   if (($tikboard[3]==$tikboard[6]) && ($tikboard[6]==$tikboard[9]))
       if($tikboard[3]) { $winner=$tikboard[1]; return; }

   if (($tikboard[1]==$tikboard[5]) && ($tikboard[5]==$tikboard[9]))
       if($tikboard[1]) { $winner=$tikboard[1]; return; }

   if (($tikboard[3]==$tikboard[5]) && ($tikboard[5]==$tikboard[7]))
       if($tikboard[3]) { $winner=$tikboard[1]; return; }
}

//Display the board if all goes well
$space=1;
echo "Current Player: " . $tikturn . "<BR><BR>n";
echo "<TABLE BORDER="1" WIDTH="200">n";
echo "<TR ALIGN="CENTER">n";
echo "<TD WIDTH="33%">".fill($space++)."</TD>n";
echo "<TD WIDTH="33%">".fill($space++)."</TD>n";
echo "<TD WIDTH="33%">".fill($space++)."</TD>n";
echo "</TR><TR ALIGN="CENTER">n";
echo "<TD WIDTH="33%">".fill($space++)."</TD>n";
echo "<TD WIDTH="33%">".fill($space++)."</TD>n";
echo "<TD WIDTH="33%">".fill($space++)."</TD>n";
echo "</TR><TR ALIGN="CENTER">n";
echo "<TD WIDTH="33%">".fill($space++)."</TD>n";
echo "<TD WIDTH="33%">".fill($space++)."</TD>n";
echo "<TD WIDTH="33%">".fill($space++)."</TD>n";
echo "</TR>n</TABLE><BR>n";
if ($winner) echo $winner." is the winner!<BR>";
echo "<A HREF="$PHP_SELF?reset=1">Start Over</A>";

endhtml();
?>
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