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<?php |
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namespace Sudoxu; |
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/** |
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* Class Sudoxu |
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* |
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* @package Sudoxu |
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* @author Burak <[email protected]> |
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*/ |
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class Sudoku |
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{ |
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public $sudoku, |
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$result, |
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$number; |
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private $limit, |
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$sq, |
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$chars, |
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$stack = array('1','2','3','4','5','6','7','8','9','0','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'); |
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/** |
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* Sudoku constructor |
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* |
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* @param int $limit |
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*/ |
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public function __construct($limit = 9) |
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{ |
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ini_set('memory_limit', -1); |
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set_time_limit(0); |
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$this->number = 0; |
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$this->limit = $limit; |
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$this->sq = (int)sqrt($this->limit); |
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$this->logic(); |
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return $this; |
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} |
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public static function world() |
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{ |
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return 'Hello World, Composer!'; |
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} |
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public function logic() |
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{ |
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if(count($this->stack) < $this->limit) |
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{ |
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echo 'error'; |
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exit; |
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} |
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} |
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public function set($number) |
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{ |
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$this->limit = $number; |
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$this->sq = (int)sqrt($this->limit); |
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return $this; |
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} |
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private function return_row($cell) |
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{ |
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return floor($cell / $this->limit); |
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} |
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private function return_col($cell) |
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{ |
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return $cell % $this->limit; |
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} |
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private function return_block($cell) |
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{ |
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return floor($this->return_row($cell) / $this->sq) * $this->sq + floor($this->return_col($cell) / $this->sq); |
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} |
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private function is_possible_row($number, $row) |
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{ |
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$possible = true; |
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for ($x = 0; $x < $this->limit; $x++) |
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{ |
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if (isset($this->sudoku[$row * $this->limit + $x]) && $this->sudoku[$row * $this->limit + $x] == $number) |
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{ |
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$possible = false; |
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} |
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} |
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return $possible; |
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} |
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private function is_possible_col($number, $col) |
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{ |
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$possible = true; |
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for ($x = 0; $x < $this->limit; $x++) |
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{ |
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if (isset($this->sudoku[$col + $this->limit * $x]) && $this->sudoku[$col + $this->limit * $x] == $number) |
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{ |
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$possible = false; |
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} |
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} |
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return $possible; |
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} |
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private function is_possible_block($number, $block) |
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{ |
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$possible = true; |
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for ($x = 0; $x < $this->limit; $x++) |
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{ |
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$index = floor($block / $this->sq) * $this->sq * $this->limit + $x % $this->sq + $this->limit * floor($x / $this->sq) + $this->sq * ($block % $this->sq); |
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if (isset($this->sudoku[$index]) && $this->sudoku[$index] == $number) |
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{ |
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$possible = false; |
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} |
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} |
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return $possible; |
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} |
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private function is_possible_number($cell, $number) |
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{ |
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$row = $this->return_row($cell); |
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$col = $this->return_col($cell); |
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$block = $this->return_block($cell); |
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return ($this->is_possible_row($number, $row) && $this->is_possible_col($number, $col) && $this->is_possible_block($number, $block)); |
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} |
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private function is_correct_row($row) |
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{ |
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$row_temp = array(); |
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for ($x = 0; $x < $this->limit; $x++) |
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{ |
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if(!isset($this->sudoku[$row * $this->limit + $x])) |
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{ |
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$this->sudoku[$row * $this->limit + $x] = null; |
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} |
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$row_temp[$x] = $this->sudoku[$row * $this->limit + $x]; |
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} |
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return count(array_diff($this->chars, $row_temp)) == 0; |
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} |
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private function is_correct_col($col) |
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{ |
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$col_temp = array(); |
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for ($x = 0; $x < $this->limit; $x++) |
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{ |
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$col_temp[$x] = $this->sudoku[$col + $x * $this->limit]; |
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} |
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return count(array_diff($this->chars, $col_temp)) == 0; |
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} |
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private function is_correct_block($block) |
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{ |
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$block_temp = array(); |
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for ($x = 0; $x < $this->limit; $x++) |
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{ |
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$lookingfor = floor($block / $this->sq) * ($this->sq * $this->limit) + ($x % $this->sq) + $this->limit * floor($x / $this->sq) + $this->sq * ($block % $this->sq); |
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if (!isset($this->sudoku[$lookingfor])) |
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{ |
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$this->sudoku[$lookingfor] = null; |
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} |
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$block_temp[$x] = $this->sudoku[$lookingfor]; |
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} |
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return count(array_diff($this->chars, $block_temp)) == 0; |
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} |
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private function is_solved_sudoku() |
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{ |
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for ($x = 0; $x < $this->limit; $x++) |
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{ |
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if (!$this->is_correct_block($x) or !$this->is_correct_row($x) or !$this->is_correct_col($x)) |
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{ |
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return false; |
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} |
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} |
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return true; |
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} |
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private function determine_possible_values($cell) |
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{ |
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$possible = array(); |
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for ($x = 0; $x < $this->limit; $x++) |
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{ |
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if ($this->is_possible_number($cell, $this->chars[$x])) |
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{ |
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array_unshift($possible, $this->chars[$x]); |
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} |
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} |
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return $possible; |
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} |
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private function determine_random_possible_value($possible, $cell) |
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{ |
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return $possible[$cell][rand(0, count($possible[$cell]) - 1)]; |
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} |
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private function scan_sudoku_for_unique() |
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{ |
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$possible = false; |
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for ($x = 0; $x < $this->limit * $this->limit; $x++) |
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{ |
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if (!isset($this->sudoku[$x])) |
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{ |
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$possible[$x] = $this->determine_possible_values($x, $this->sudoku); |
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if (count($possible[$x]) == 0) |
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{ |
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return (false); |
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} |
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} |
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} |
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return $possible; |
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} |
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private function remove_attempt($attempt_array, $number) |
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{ |
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$new_array = array(); |
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$count = count($attempt_array); |
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for ($x = 0; $x < $count; $x++) |
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{ |
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if ($attempt_array[$x] != $number) |
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{ |
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array_unshift($new_array, $attempt_array[$x]); |
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} |
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} |
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return $new_array; |
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} |
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private function next_random($possible) |
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{ |
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$min_choices = null; |
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$max = $this->limit; |
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for ($x = 0; $x < $this->limit * $this->limit; $x++) |
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{ |
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if (!isset($possible[$x])) |
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{ |
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$possible[$x] = null; |
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} |
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if ((count($possible[$x]) <= $max) && (count($possible[$x]) > 0)) |
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{ |
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$max = count($possible[$x]); |
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$min_choices = $x; |
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} |
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} |
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return $min_choices; |
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} |
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private function build() |
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{ |
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$this->sudoku = array(); |
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$this->chars = array(); |
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for ($i = 0; $i < $this->limit; $i++) |
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{ |
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$this->chars[] = $this->stack[$i]; |
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} |
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} |
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public function microtime() |
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{ |
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return microtime(true); |
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} |
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public function generate() |
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{ |
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$start = $this->microtime(); |
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$this->build(); |
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$x = 0; |
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$saved = array(); |
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$saved_sud = array(); |
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while (!$this->is_solved_sudoku()) |
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{ |
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$x++; |
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$next_move = $this->scan_sudoku_for_unique(); |
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if ($next_move === false) |
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{ |
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$next_move = array_pop($saved); |
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$this->sudoku = array_pop($saved_sud); |
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} |
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$what_to_try = $this->next_random($next_move); |
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$attempt = $this->determine_random_possible_value($next_move, $what_to_try); |
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if (count($next_move[$what_to_try]) > 1) |
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{ |
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$next_move[$what_to_try] = $this->remove_attempt($next_move[$what_to_try], $attempt); |
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array_push($saved, $next_move); |
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array_push($saved_sud, $this->sudoku); |
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} |
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$this->sudoku[$what_to_try] = $attempt; |
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} |
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308
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309
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$timing = $this->microtime() - $start; |
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$this->result = array( |
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'created_in' => round($timing,2), |
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'difficulty' => 'N/A' |
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); |
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314
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315
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return $this; |
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316
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} |
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317
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318
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private function array2export() |
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319
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{ |
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320
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return array( |
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321
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'sudoku' => $this->sudoku, |
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322
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'limit' => $this->limit, |
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323
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'result' => $this->result, |
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324
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325
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); |
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326
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} |
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327
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328
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public function to($to) |
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329
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{ |
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330
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if($to == 'json') |
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331
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{ |
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332
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return json_encode($this->array2export()); |
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333
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} |
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334
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else if($to == 'serialize') |
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335
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{ |
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336
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|
|
return serialize($this->array2export()); |
|
337
|
|
|
} |
|
338
|
|
|
else if($to == 'html') |
|
339
|
|
|
{ |
|
340
|
|
|
return serialize($this->array2export()); |
|
341
|
|
|
} |
|
342
|
|
|
} |
|
343
|
|
|
|
|
344
|
|
|
|
|
345
|
|
|
public function draw($echo = true) |
|
346
|
|
|
{ |
|
347
|
|
|
|
|
348
|
|
|
|
|
349
|
|
|
$string = "<table cellpadding='0' cellspacing='0' style='margin:0 auto;font:30px Arial;border:3px solid black'>"; |
|
350
|
|
|
|
|
351
|
|
|
for ($u = 0; $u < $this->limit; $u++) |
|
352
|
|
|
{ |
|
353
|
|
|
|
|
354
|
|
|
|
|
355
|
|
|
if (($u + 1) % $this->sq == '0') |
|
356
|
|
|
{ |
|
357
|
|
|
$border = 3; |
|
358
|
|
|
} else { |
|
359
|
|
|
$border = 1; |
|
360
|
|
|
} |
|
361
|
|
|
|
|
362
|
|
|
$string .= '<tr>'; |
|
363
|
|
|
|
|
364
|
|
|
for ($v = 0; $v < $this->limit; $v++) |
|
365
|
|
|
{ |
|
366
|
|
|
|
|
367
|
|
|
|
|
368
|
|
|
if (($v + 1) % $this->sq == '0') |
|
369
|
|
|
{ |
|
370
|
|
|
$border2 = 3; |
|
371
|
|
|
} else { |
|
372
|
|
|
$border2 = 1; |
|
373
|
|
|
} |
|
374
|
|
|
|
|
375
|
|
|
$string .= '<td |
|
376
|
|
|
data-row="'.$u.'" |
|
377
|
|
|
data-col="'.$v.'" |
|
378
|
|
|
style="border: 1px solid black;border-bottom:' . $border . 'px solid black;border-right:' . $border2 . 'px solid black;line-height: 50px; width: 50px; text-align: center; vertical-align: middle;">'; |
|
379
|
|
|
$string .=($this->sudoku[$v * $this->limit + $u]); |
|
380
|
|
|
$string .= '</td>'; |
|
381
|
|
|
|
|
382
|
|
|
} |
|
383
|
|
|
|
|
384
|
|
|
$string .= '</tr>'; |
|
385
|
|
|
|
|
386
|
|
|
} |
|
387
|
|
|
|
|
388
|
|
|
$string .= "</table>"; |
|
389
|
|
|
|
|
390
|
|
|
|
|
391
|
|
|
if($echo === true) |
|
392
|
|
|
{ |
|
393
|
|
|
echo $string; |
|
394
|
|
|
} |
|
395
|
|
|
else |
|
396
|
|
|
{ |
|
397
|
|
|
return $string; |
|
398
|
|
|
} |
|
399
|
|
|
|
|
400
|
|
|
} |
|
401
|
|
|
|
|
402
|
|
|
} |
frnxstd /
sudoxu
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In general, usage of exit should be done with care and only when running in a scripting context like a CLI script.