/**
* decode_board() - Convert between coded GET parameter and $board_array
* encode_board()
*/
function decode_board($board_coded)
{
$ret = new_board();
$length = strlen($board_coded);
for ($i = 0; $i < $length; $i += 2) {
$piece = substr($board_coded, $i, 1);
$code = substr($board_coded, $i + 1, 1);
$p = strpos(LOCATION_CODES, $code);
$col = $p % 8;
$row = ($p - $col) / 8;
$ret[$row][$col] = $piece;
}
return $ret;
}
/**
* hot_fields()
*/
function hot_fields($board_array, $current_player)
{
$ret = array();
$hot_array = new_board();
$movable_opponents = find_movable_pieces($board_array, !$current_player);
foreach ($movable_opponents as $from_field) {
$possible_moves = possible_move_list($board_array, !$current_player, $from_field);
foreach ($possible_moves as $to_field) {
list($row, $col) = field_to_rowcol($to_field);
$hot_array[$row][$col] = 'not empty';
}
}
for ($row = 0; $row < 8; $row++) {
for ($col = 0; $col < 8; $col++) {
if ($hot_array[$row][$col] == 'not empty') {
$ret[] = rowcol_to_field($row, $col);
}
}
}
return $ret;
}