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Creating A Game With PHP Part 2: Tic Tac Toe (see https://www.hashbangcode.com/article/creating-game-php-part-2-tic-tac-toe)
<?php
function renderGame($state, $activeCell, $player) {
$output = '';
$output .= 'Player:' . $player . PHP_EOL;
foreach ($state as $x => $line) {
$output .= '|';
foreach ($line as $y => $item) {
switch ($item) {
case '';
$cell = ' ';
break;
case 'X';
$cell = 'X';
break;
case 'O';
$cell = 'O';
break;
}
if ($activeCell[0] == $x && $activeCell[1] == $y) {
$cell = '-'. $cell . '-';
}
else {
$cell = ' ' . $cell . ' ';
}
$output .= $cell . '|';
}
$output .= PHP_EOL;
}
return $output;
}
function isWinState($state) {
foreach (['X', 'O'] as $player) {
foreach ($state as $x => $line) {
if ($state[$x][0] == $player && $state[$x][1] == $player && $state[$x][2] == $player) {
die($player . ' wins');
}
foreach ($line as $y => $item) {
if ($state[0][$y] == $player && $state[1][$y] == $player && $state[2][$y] == $player) {
die($player . ' wins');
}
}
}
if ($state[0][0] == $player && $state[1][1] == $player && $state[2][2] == $player) {
die($player . ' wins');
}
if ($state[2][0] == $player && $state[1][1] == $player && $state[0][2] == $player) {
die($player . ' wins');
}
}
// Game might be a draw.
$blankQuares = 0;
foreach ($state as $x => $line) {
foreach ($line as $y => $item) {
if ($state[$x][$y] == '') {
$blankQuares++;
}
}
}
if ($blankQuares == 0) {
die('DRAW!');
}
}
function move($stdin, &$state, &$activeCell, &$player) {
$key = fgets($stdin);
if ($key) {
$key = translateKeypress($key);
switch ($key) {
case "UP":
if ($activeCell[0] >= 1) {
$activeCell[0]--;
}
break;
case "DOWN":
if ($activeCell[0] < 2) {
$activeCell[0]++;
}
break;
case "RIGHT":
if ($activeCell[1] < 2) {
$activeCell[1]++;
}
break;
case "LEFT":
if ($activeCell[1] >= 1) {
$activeCell[1]--;
}
break;
case "ENTER":
case "SPACE":
if ($state[$activeCell[0]][$activeCell[1]] == '') {
$state[$activeCell[0]][$activeCell[1]] = $player;
if ($player == 'X') {
$player = 'O';
} else {
$player = 'X';
}
}
break;
}
}
}
function translateKeypress($string) {
switch ($string) {
case "\033[A":
return "UP";
case "\033[B":
return "DOWN";
case "\033[C":
return "RIGHT";
case "\033[D":
return "LEFT";
case "\n":
case " ":
return "ENTER";
}
return $string;
}
$state = [
['', '', ''],
['', '', ''],
['', '', ''],
];
system('stty cbreak -echo');
$stdin = fopen('php://stdin', 'r');
stream_set_blocking($stdin, 0);
$activeCell = [0 => 0, 1 => 0];
$player = 'X';
while (1) {
system('clear');
move($stdin, $state, $activeCell, $player);
echo renderGame($state, $activeCell, $player);
isWinState($state);
}
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