function begin($startX, $startY)
{
if ($startY > 0 && $startY == $startX) {
begin($startY - 1, $startY - 1, $board);
}
if ($startX > 0) {
begin($startX - 1, $startY, $board);
}
$board = newBoard();
$board[$startY][$startX] = 1;
//the first move location will be "1"
echo "Starting at: (" . $startY . "," . $startX . ")\n";
$solution = solve($board, $startY, $startX, 2);
}
// colours
while ($p1 != 'R' && $p1 != 'Y') {
$p1 = strtoupper(readline("player 1, please choose a colour (R/Y): "));
}
if ($p1 == 'R') {
$p2 = 'Y';
} else {
$p2 = 'R';
}
// number of players
$players = 0;
while ($players != 1 && $players != 2) {
$players = readline("number of players (1/2): ");
}
// game
$board = newBoard();
$colours = [$p1, $p2];
while (!$win) {
foreach ($colours as $idx => $colour) {
if ($idx == 1 && $players == 1) {
$cpu = 1;
} else {
$cpu = 0;
}
$board = go($board, $colour, $cpu);
if ($board == 1) {
$win = true;
break;
}
}
}