wrurik / sudoku

Sudoku

Solver

Usage

$solver = new Wrurik\Sudoku\Solver($array);
$solution = $solver->resolve();

Input

The input should be an array of exactly 81 elements, representing the cells in a sudoku puzzle counting from top left to bottom right.

You can also supply the sudoku as a multi-dimensional array containing 9 rows or 9 columns:

$input = [
    [0,0,0,0,0,0,0,0,0],
    [0,0,0,0,0,0,0,0,0],
    [0,0,0,0,0,0,0,0,0],
    [0,0,0,0,0,0,0,0,0],
    [0,0,0,0,0,0,0,0,0],
    [0,0,0,0,0,0,0,0,0],
    [0,0,0,0,0,0,0,0,0],
    [0,0,0,0,0,0,0,0,0],
    [0,0,0,0,0,0,0,0,0]
];

$solver = Wrurik\Sudoku\Solver::fromRows($input);
$solver = Wrurik\Sudoku\Solver::fromColumns($input);

Handling empty cells

By default 0 is used for empty cells. You can change it:

$solver->setEmptyValue($yourPreferedEmptyValue);

Solution

Solution is returned from the $solver->resolve() method.
Solution is provided as an array of 81 elements. Even if your input was from rows or columns.

Exceptions

If no solution can be found an InvalidSudokuException is thrown.
If the input is in an incorrect format an InvalidInputException is thrown.