Generate random Sudokus of different size and difficulty and check the solution.

1.0.0 2016-03-26 13:40 UTC

This package is auto-updated.

Last update: 2023-01-13 22:56:38 UTC


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Generate random Sudokus of different size and difficulty and check the solution. Features:

  • Choose from the following sizes: 4, 9, 16, 25, 36.
  • Choose from fife degrees of difficulty.
  • Sudokus are reproducible via a integer seed.
  • Check if a input is a solution of any Sudoku or a solution to a specific task.
  • Solve Sudokus.
  • works with PHP 5.6 and 7.0 (maybe also with PHP < 5.6, but no one should use that old PHP versions)
  • backend only, so you can build your own frontend however you like it.


You can install this via composer using

    "require": {
        "abcaeffchen/sudoku-php": "~1.0.0"

or just download the Sudoku.php file and include it to your project. Make sure to use the namespace AbcAeffchen\sudoku.

How to use

Generate a task

use AbcAeffchen\sudoku\Sudoku;
$task = Sudoku::generate(9, Sudoku::NORMAL);

Generates a standard 9x9 Sudoku with normal difficulty. You can use the difficulties VERY_EASY, EASY, NORMAL, MEDIUM, HARD.

$task contains a two dimensional array of integers, where the gaps are set to null. You can use

list($task,$solution) = Sudoku::generateWithSolution(9, Sudoku::NORMAL)

to generate a task and a possible solution. Maybe to give hints?

You can reproduce the Sudoku by providing a seed.

$seed = 0;
$task = Sudoku::generate(9, Sudoku::NORMAL, $seed);

This way cou could store a seed seed and reproduce the task at any time.
The seed can be any positive integer.

Check a solution

You can check a solution by using

    echo 'Nice done!';
    echo 'Try again!';

If you also want to also check if the solution relates to the task, you can just also provide the task like this:


Solve Sudokus

This function is used to generate the Sudokus, but you can also use it to solve some you generated by hand (or get it from somewhere else).

$solution = Sudoku::solve($task);

You only have to make sure, that $task is a two dimensional int array containing only numbers from 1 to the size and all gaps contain null.


Licensed under the LGPL v3.0 License.