if ($this->d1 != 1 && !isset($this->visited[join(",", array($this->d1 - 1, $this->d2))])) {
array_push($x, array($this->d1 - 1, $this->d2));
}
if ($this->d1 != 4 && !isset($this->visited[join(",", array($this->d1 + 1, $this->d2))])) {
array_push($x, array($this->d1 + 1, $this->d2));
}
if ($this->d2 != 1 && !isset($this->visited[join(",", array($this->d1, $this->d2 - 1))])) {
array_push($x, array($this->d1, $this->d2 - 1));
}
if ($this->d2 != 4 && !isset($this->visited[join(",", array($this->d1, $this->d2 + 1))])) {
array_push($x, array($this->d1, $this->d2 + 1));
}
$l = count($x);
$new_point_array = array(0, 0);
//Default is no choice
if ($l > 0) {
//If the length of X is > 0, we have choices.
shuffle($x);
$new_point_array = $x[array_rand($x, 1)];
$this->d1 = $new_point_array[0];
$this->d2 = $new_point_array[1];
$new_point_array_as_string = join(",", $new_point_array);
$this->visited[$new_point_array_as_string] = true;
$this->path .= $new_point_array_as_string . " ";
}
return $new_point_array;
}
}
$g = new GridHelper();
print $g->seek() . "\n";
exit;
