This document contains PHP code for implementing a Tic Tac Toe game. It includes functions for generating the game board, tracking empty spaces, determining valid player moves, checking for wins or draws, and displaying the outcome. The code uses arrays to track the state of each space on the board as well as rows, columns and diagonals to detect winning patterns. It also includes logic for the computer to select optimal moves when it is their turn.

1. Tic Tac Toe in PHP';
for($i=0; $i<$size; $i++) {
for($j=0; $j<$size; $j++) {
$count++;
$retVal.='';
}
$retVal.='
';
}
$retVal.='';
echo $retVal;
}
function genBox2($size,$arr) {
global
$bsize,$playerToken,$myToken,$gameOver,$winArr,$rowArr,$colArr,$digArr,$vals,$s1,$s2,$s
3,$s4,$s5,$s6,$s7,$s8,$s9;
$count=0;
$retVal='';
for($i=0; $i<$size; $i++) {
for($j=0; $j<$size; $j++) {
$count++;
$retVal.='';
}
$retVal.='
';
}
$retVal.='';
echo $retVal;
}
function isEmpty($who) {
if($who=="")
return 1;
else
return 0;
}
function move($bsize,$arr) {

2. global
$bsize,$playerToken,$myToken,$gameOver,$winArr,$rowArr,$colArr,$digArr,$vals,$s1,$s2,$s
3,$s4,$s5,$s6,$s7,$s8,$s9;
$count=0;
$maxCount=0;
$pos=0;
$retVal=0;
# Build Row Array
for($i=0; $i<$bsize; $i++) {
$maxCount=0;
$fullCounter=0;
for($j=0; $j<$bsize; $j++) {
$count++;
$who=$arr[$count-1];
if($who==$playerToken) {
$maxCount++;
$fullCounter++;
}
if($who==$myToken)
$fullCounter++;
}
$rowArr[$i]=$maxCount;
if($fullCounter==$bsize)
$rowArr[$i]=-1;
}
# Building Column Array
for($i=0; $i<$bsize; $i++) {
$count=$i+1;
$maxCount=0;
$fullCounter=0;
for($j=0; $j<$bsize; $j++) {
$who=$arr[$count-1];
if($who==$playerToken) {
$maxCount++;
$fullCounter++;

3. }
if($who==$myToken)
$fullCounter++;
$count+=$bsize;
}
$colArr[$i]=$maxCount;
if($fullCounter==$bsize)
$colArr[$i]=-1;
}
# Building Diagonal Array
for($i=0; $i<2; $i++) {
if($i==0)
$count=$i+1;
else
$count=$bsize;
$maxCount=0;
$fullCounter=0;
for($j=0; $j<$bsize; $j++) {
$who=$arr[$count-1];
if($who==$playerToken) {
$maxCount++;
$fullCounter++;
}
if($who==$myToken)
$fullCounter++;
if($i==0)
$count+=$bsize+1;
else
$count+=$bsize-1;
}
$digArr[$i]=$maxCount;
if($fullCounter==$bsize)
$digArr[$i]=-1;
}
# Finding Max Values
$maxRow=myMax(0,$bsize,"row",$rowArr);

4. $maxCol=myMax(0,$bsize,"col",$colArr);
$maxDig=myMax(0,$bsize,"dig",$digArr);
$maxArrs[0]=myMax(1,$bsize,"row",$rowArr);
$maxArrs[1]=myMax(1,$bsize,"col",$colArr);
$maxArrs[2]=myMax(1,$bsize,"dig",$digArr);
//$maxArrs=array(max(1,$bsize,"row",$rowArr),max(1,$bsize,"col",$colArr),max(1,$bsize,"
dig",$digArr));
if(myMax(0,$bsize,"x",$maxArrs)==0)
$pos=$bsize*($maxRow+1)-$bsize;
if(myMax(0,$bsize,"x",$maxArrs)==1)
$pos=$maxCol;
if(myMax(0,$bsize,"x",$maxArrs)==2)
if($maxDig==0)
$pos=$maxDig;
else
$pos=$bsize-1;
$retFlag=0;
for($y=0; $y<$bsize; $y++) {
if(!$retFlag) {
if($arr[$pos]=="") {
$retVal=$pos;
$retFlag=1;
}
if(myMax(0,$bsize,"x",$maxArrs)==0)
$pos++;
if(myMax(0,$bsize,"x",$maxArrs)==1)
$pos+=$bsize;
if(myMax(0,$bsize,"x",$maxArrs)==2)
if($maxDig==0)
$pos+=$bsize+1;
else
$pos+=$bsize-1;
}
}
return $retVal;

5. }
function myMax($what,$bsize,$type,$arr) {
global
$bsize,$playerToken,$myToken,$gameOver,$winArr,$rowArr,$colArr,$digArr,$vals,$s1,$s2,$s
3,$s4,$s5,$s6,$s7,$s8,$s9;
$max=-1;
$maxIndex=-1;
if($type!="dig") {
for($i=0; $i<$bsize; $i++) {
if($arr[$i]>$max) {
$max=$arr[$i];
$maxIndex=$i;
}
}
}
if($type=="dig") {
for($i=0; $i<2; $i++) {
if($arr[$i]>$max) {
$max=$arr[$i];
$maxIndex=$i;
}
}
}
if($what==0)
return $maxIndex;
else
return $max;
}
function playerWin() {
global
$bsize,$playerToken,$myToken,$gameOver,$winArr,$rowArr,$colArr,$digArr,$vals,$s1,$s2,$s
3,$s4,$s5,$s6,$s7,$s8,$s9;
$who=$playerToken;
if(($s1==$who && $s2==$s1 && $s3==$s1) || ($s4==$who && $s5==$s4 &&
$s6==$s4)||($s7==$who && $s8==$s7 && $s9==$s7) ||($s1==$who && $s4==$s1 &&
$s7==$s1) ||($s2==$who && $s5==$s2 && $s8==$s2) ||($s3==$who && $s6==$s3 &&

6. $s9==$s3) ||($s1==$who && $s5==$s1 && $s9==$s1) ||($s3==$who && $s5==$s3 &&
$s7==$s3))
return 1;
else
return 0;
}
function iWin() {
global
$bsize,$playerToken,$myToken,$gameOver,$winArr,$rowArr,$colArr,$digArr,$vals,$s1,$s2,$s
3,$s4,$s5,$s6,$s7,$s8,$s9;
$who=$myToken;
if(($s1==$who && $s2==$s1 && $s3==$s1) || ($s4==$who && $s5==$s4 &&
$s6==$s4)||($s7==$who && $s8==$s7 && $s9==$s7) ||($s1==$who && $s4==$s1 &&
$s7==$s1) ||($s2==$who && $s5==$s2 && $s8==$s2) ||($s3==$who && $s6==$s3 &&
$s9==$s3) ||($s1==$who && $s5==$s1 && $s9==$s1) ||($s3==$who && $s5==$s3 &&
$s7==$s3))
return 1;
else
return 0;
}
function whereWinComp() {
global
$bsize,$playerToken,$myToken,$gameOver,$winArr,$rowArr,$colArr,$digArr,$vals,$s1,$s2,$s
3,$s4,$s5,$s6,$s7,$s8,$s9;
$who=$myToken;
if(($s1==$who && $s2==$s1 && $s3==$s1))
$winArr=array('s1','s2','s3');
if(($s4==$who && $s5==$s4 && $s6==$s4))
$winArr=array('s4','s5','s6');
if(($s7==$who && $s8==$s7 && $s9==$s7))
$winArr=array('s7','s8','s9');
if(($s1==$who && $s4==$s1 && $s7==$s1))
$winArr=array('s1','s4','s7');
if(($s2==$who && $s5==$s2 && $s8==$s2))
$winArr=array('s2','s5','s8');
if(($s3==$who && $s6==$s3 && $s9==$s3))

7. $winArr=array('s3','s6','s9');
if(($s1==$who && $s5==$s1 && $s9==$s1))
$winArr=array('s1','s5','s9');
if(($s3==$who && $s5==$s3 && $s7==$s3))
$winArr=array('s3','s5','s7');
}
function whereWinPlayer() {
global
$bsize,$playerToken,$myToken,$gameOver,$winArr,$rowArr,$colArr,$digArr,$vals,$s1,$s2,$s
3,$s4,$s5,$s6,$s7,$s8,$s9;
$who=$playerToken;
if(($s1==$who && $s2==$s1 && $s3==$s1))
$winArr=array('s1','s2','s3');
if(($s4==$who && $s5==$s4 && $s6==$s4))
$winArr=array('s4','s5','s6');
if(($s7==$who && $s8==$s7 && $s9==$s7))
$winArr=array('s7','s8','s9');
if(($s1==$who && $s4==$s1 && $s7==$s1))
$winArr=array('s1','s4','s7');
if(($s2==$who && $s5==$s2 && $s8==$s2))
$winArr=array('s2','s5','s8');
if(($s3==$who && $s6==$s3 && $s9==$s3))
$winArr=array('s3','s6','s9');
if(($s1==$who && $s5==$s1 && $s9==$s1))
$winArr=array('s1','s5','s9');
if(($s3==$who && $s5==$s3 && $s7==$s3))
$winArr=array('s3','s5','s7');
}
function draw() {
global
$bsize,$playerToken,$myToken,$gameOver,$winArr,$rowArr,$colArr,$digArr,$vals,$s1,$s2,$s
3,$s4,$s5,$s6,$s7,$s8,$s9;
$drawCounter=0;
$dCounter=0;
for($dCounter=0; $dCounterWow! You Won!

8. ';
echo '
';
whereWinPlayer();
echo '';
$gameOver=1;
}
if (iWin() && !$gameOver) {
echo 'Oops! You Lost!
';
echo '
';
whereWinComp();
echo '';
$gameOver=1;
}
if(draw() && !playerWin() && !iWin()) {
echo 'It's a Draw!
';
echo '
';
print '';
}
}
else
genBox($bsize);
?>
© 2004 Premshree Pillai | Sign my Guestbook.
Solution
Tic Tac Toe in PHP';

9. for($i=0; $i<$size; $i++) {
for($j=0; $j<$size; $j++) {
$count++;
$retVal.='';
}
$retVal.='
';
}
$retVal.='';
echo $retVal;
}
function genBox2($size,$arr) {
global
$bsize,$playerToken,$myToken,$gameOver,$winArr,$rowArr,$colArr,$digArr,$vals,$s1,$s2,$s
3,$s4,$s5,$s6,$s7,$s8,$s9;
$count=0;
$retVal='';
for($i=0; $i<$size; $i++) {
for($j=0; $j<$size; $j++) {
$count++;
$retVal.='';
}
$retVal.='
';
}
$retVal.='';
echo $retVal;
}
function isEmpty($who) {
if($who=="")
return 1;
else
return 0;
}
function move($bsize,$arr) {
global

10. $bsize,$playerToken,$myToken,$gameOver,$winArr,$rowArr,$colArr,$digArr,$vals,$s1,$s2,$s
3,$s4,$s5,$s6,$s7,$s8,$s9;
$count=0;
$maxCount=0;
$pos=0;
$retVal=0;
# Build Row Array
for($i=0; $i<$bsize; $i++) {
$maxCount=0;
$fullCounter=0;
for($j=0; $j<$bsize; $j++) {
$count++;
$who=$arr[$count-1];
if($who==$playerToken) {
$maxCount++;
$fullCounter++;
}
if($who==$myToken)
$fullCounter++;
}
$rowArr[$i]=$maxCount;
if($fullCounter==$bsize)
$rowArr[$i]=-1;
}
# Building Column Array
for($i=0; $i<$bsize; $i++) {
$count=$i+1;
$maxCount=0;
$fullCounter=0;
for($j=0; $j<$bsize; $j++) {
$who=$arr[$count-1];
if($who==$playerToken) {
$maxCount++;
$fullCounter++;
}

11. if($who==$myToken)
$fullCounter++;
$count+=$bsize;
}
$colArr[$i]=$maxCount;
if($fullCounter==$bsize)
$colArr[$i]=-1;
}
# Building Diagonal Array
for($i=0; $i<2; $i++) {
if($i==0)
$count=$i+1;
else
$count=$bsize;
$maxCount=0;
$fullCounter=0;
for($j=0; $j<$bsize; $j++) {
$who=$arr[$count-1];
if($who==$playerToken) {
$maxCount++;
$fullCounter++;
}
if($who==$myToken)
$fullCounter++;
if($i==0)
$count+=$bsize+1;
else
$count+=$bsize-1;
}
$digArr[$i]=$maxCount;
if($fullCounter==$bsize)
$digArr[$i]=-1;
}
# Finding Max Values
$maxRow=myMax(0,$bsize,"row",$rowArr);
$maxCol=myMax(0,$bsize,"col",$colArr);

12. $maxDig=myMax(0,$bsize,"dig",$digArr);
$maxArrs[0]=myMax(1,$bsize,"row",$rowArr);
$maxArrs[1]=myMax(1,$bsize,"col",$colArr);
$maxArrs[2]=myMax(1,$bsize,"dig",$digArr);
//$maxArrs=array(max(1,$bsize,"row",$rowArr),max(1,$bsize,"col",$colArr),max(1,$bsize,"
dig",$digArr));
if(myMax(0,$bsize,"x",$maxArrs)==0)
$pos=$bsize*($maxRow+1)-$bsize;
if(myMax(0,$bsize,"x",$maxArrs)==1)
$pos=$maxCol;
if(myMax(0,$bsize,"x",$maxArrs)==2)
if($maxDig==0)
$pos=$maxDig;
else
$pos=$bsize-1;
$retFlag=0;
for($y=0; $y<$bsize; $y++) {
if(!$retFlag) {
if($arr[$pos]=="") {
$retVal=$pos;
$retFlag=1;
}
if(myMax(0,$bsize,"x",$maxArrs)==0)
$pos++;
if(myMax(0,$bsize,"x",$maxArrs)==1)
$pos+=$bsize;
if(myMax(0,$bsize,"x",$maxArrs)==2)
if($maxDig==0)
$pos+=$bsize+1;
else
$pos+=$bsize-1;
}
}
return $retVal;
}

13. function myMax($what,$bsize,$type,$arr) {
global
$bsize,$playerToken,$myToken,$gameOver,$winArr,$rowArr,$colArr,$digArr,$vals,$s1,$s2,$s
3,$s4,$s5,$s6,$s7,$s8,$s9;
$max=-1;
$maxIndex=-1;
if($type!="dig") {
for($i=0; $i<$bsize; $i++) {
if($arr[$i]>$max) {
$max=$arr[$i];
$maxIndex=$i;
}
}
}
if($type=="dig") {
for($i=0; $i<2; $i++) {
if($arr[$i]>$max) {
$max=$arr[$i];
$maxIndex=$i;
}
}
}
if($what==0)
return $maxIndex;
else
return $max;
}
function playerWin() {
global
$bsize,$playerToken,$myToken,$gameOver,$winArr,$rowArr,$colArr,$digArr,$vals,$s1,$s2,$s
3,$s4,$s5,$s6,$s7,$s8,$s9;
$who=$playerToken;
if(($s1==$who && $s2==$s1 && $s3==$s1) || ($s4==$who && $s5==$s4 &&
$s6==$s4)||($s7==$who && $s8==$s7 && $s9==$s7) ||($s1==$who && $s4==$s1 &&
$s7==$s1) ||($s2==$who && $s5==$s2 && $s8==$s2) ||($s3==$who && $s6==$s3 &&
$s9==$s3) ||($s1==$who && $s5==$s1 && $s9==$s1) ||($s3==$who && $s5==$s3 &&

14. $s7==$s3))
return 1;
else
return 0;
}
function iWin() {
global
$bsize,$playerToken,$myToken,$gameOver,$winArr,$rowArr,$colArr,$digArr,$vals,$s1,$s2,$s
3,$s4,$s5,$s6,$s7,$s8,$s9;
$who=$myToken;
if(($s1==$who && $s2==$s1 && $s3==$s1) || ($s4==$who && $s5==$s4 &&
$s6==$s4)||($s7==$who && $s8==$s7 && $s9==$s7) ||($s1==$who && $s4==$s1 &&
$s7==$s1) ||($s2==$who && $s5==$s2 && $s8==$s2) ||($s3==$who && $s6==$s3 &&
$s9==$s3) ||($s1==$who && $s5==$s1 && $s9==$s1) ||($s3==$who && $s5==$s3 &&
$s7==$s3))
return 1;
else
return 0;
}
function whereWinComp() {
global
$bsize,$playerToken,$myToken,$gameOver,$winArr,$rowArr,$colArr,$digArr,$vals,$s1,$s2,$s
3,$s4,$s5,$s6,$s7,$s8,$s9;
$who=$myToken;
if(($s1==$who && $s2==$s1 && $s3==$s1))
$winArr=array('s1','s2','s3');
if(($s4==$who && $s5==$s4 && $s6==$s4))
$winArr=array('s4','s5','s6');
if(($s7==$who && $s8==$s7 && $s9==$s7))
$winArr=array('s7','s8','s9');
if(($s1==$who && $s4==$s1 && $s7==$s1))
$winArr=array('s1','s4','s7');
if(($s2==$who && $s5==$s2 && $s8==$s2))
$winArr=array('s2','s5','s8');
if(($s3==$who && $s6==$s3 && $s9==$s3))
$winArr=array('s3','s6','s9');

15. if(($s1==$who && $s5==$s1 && $s9==$s1))
$winArr=array('s1','s5','s9');
if(($s3==$who && $s5==$s3 && $s7==$s3))
$winArr=array('s3','s5','s7');
}
function whereWinPlayer() {
global
$bsize,$playerToken,$myToken,$gameOver,$winArr,$rowArr,$colArr,$digArr,$vals,$s1,$s2,$s
3,$s4,$s5,$s6,$s7,$s8,$s9;
$who=$playerToken;
if(($s1==$who && $s2==$s1 && $s3==$s1))
$winArr=array('s1','s2','s3');
if(($s4==$who && $s5==$s4 && $s6==$s4))
$winArr=array('s4','s5','s6');
if(($s7==$who && $s8==$s7 && $s9==$s7))
$winArr=array('s7','s8','s9');
if(($s1==$who && $s4==$s1 && $s7==$s1))
$winArr=array('s1','s4','s7');
if(($s2==$who && $s5==$s2 && $s8==$s2))
$winArr=array('s2','s5','s8');
if(($s3==$who && $s6==$s3 && $s9==$s3))
$winArr=array('s3','s6','s9');
if(($s1==$who && $s5==$s1 && $s9==$s1))
$winArr=array('s1','s5','s9');
if(($s3==$who && $s5==$s3 && $s7==$s3))
$winArr=array('s3','s5','s7');
}
function draw() {
global
$bsize,$playerToken,$myToken,$gameOver,$winArr,$rowArr,$colArr,$digArr,$vals,$s1,$s2,$s
3,$s4,$s5,$s6,$s7,$s8,$s9;
$drawCounter=0;
$dCounter=0;
for($dCounter=0; $dCounterWow! You Won!
';

16. echo '
';
whereWinPlayer();
echo '';
$gameOver=1;
}
if (iWin() && !$gameOver) {
echo 'Oops! You Lost!
';
echo '
';
whereWinComp();
echo '';
$gameOver=1;
}
if(draw() && !playerWin() && !iWin()) {
echo 'It's a Draw!
';
echo '
';
print '';
}
}
else
genBox($bsize);
?>
© 2004 Premshree Pillai | Sign my Guestbook.