Unbeatable Tic-Tac-Toe

Warning: DOMDocument::load(): Extra content at the end of the document in /usr/local/www/apache24/data/tictactoe/games.xml, line: 8 in /usr/local/www/apache24/data/tictactoe/index.php on line 87

Warning: DOMDocument::load(): Extra content at the end of the document in /usr/local/www/apache24/data/tictactoe/games.xml, line: 8 in /usr/local/www/apache24/data/tictactoe/index.php on line 103

Warning: Attempt to read property "lastChild" on null in /usr/local/www/apache24/data/tictactoe/index.php on line 104

Fatal error: Uncaught Error: Call to a member function appendChild() on null in /usr/local/www/apache24/data/tictactoe/index.php:114 Stack trace: #0 /usr/local/www/apache24/data/tictactoe/index.php(340): new_game('216.73.216.61') #1 {main} thrown in /usr/local/www/apache24/data/tictactoe/index.php on line 114