PHP script of tic-tac-toe game

PHP script for the game of tic-tac-toe.
The script consists of three files - a form for the game, a style file(two pictures) and a class that performs calculations.

Features of the script:
Implemented validation of incoming data.
Exception Handling.
The script is written using OOP.
Two people play, take turns clicking on the playing field.
The game is not online from two different computers, both players play on the same computer in turn.
The moves are stored in the session.
All methods are documented.
PHPDoc.
The script is tested on php versions 7.0.0 and higher.

PHP version 7.0.0 or higher is required

Demo of the script https://scripts.php-include.ru/tic_tac_toe/index.php

Installation:
Copy file TicTacToe.php
Copy the index.php file (or its content into the script you need)
Copy file styles.css
Copy the images folder