This is an adaptation of rcammisola's solution to the N-Queens problem solved in PHP with recursion.
The original class output a text-based grid like this:
|Q| | | | | | | |
-----------------
| | | | |Q| | | |
-----------------
| | | | | | | |Q|
-----------------
| | | | | |Q| | |
-----------------
| | |Q| | | | | |
-----------------
| | | | | | |Q| |
-----------------
| |Q| | | | | | |
-----------------
| | | |Q| | | | |
-----------------
My changes are mainly cosmetic:
- A select box from where you can choose the grid size (number of queens)
- Added an alternative output style: an HTML table. You can still output a text-based board by passing anything to the print_board method, e.g.
$q->print_board(1); - A bit of Bootstrap for its grids, navs, and button styles (chosen because it's the CSS framework with which I'm most familiar). Thanks to Bootstrap and a teeny bit of extra CSS, the chess board should fit to the screen without any overflow on any size of device.
- An SVG queen: queen by Dolly Holmes from the Noun Project
- Wrapped text-based board in a pre tag so it aligns nicely.
Other changes include:
- Modifying how default values are handled (construct/solve methods)
- Splitting the methods that construct the output from the ones that actually display it
- PHP formatting changes (based upon my own personal preference, which stems from working with Wordpress). Mostly this means: curly braces open on the same line but close on a new line, and there are spaces inside parenthesis and around operators / operands.