Two words first letters flipped
Fatal error: Uncaught TypeError: sizeof(): Argument #1 ($value) must be of type Countable|array, string given in /data03/virt133016/domeenid/www.onu.ee/htdocs/app/scripts/games/flip_letters.php:42
Stack trace:
#0 {main}
thrown in /data03/virt133016/domeenid/www.onu.ee/htdocs/app/scripts/games/flip_letters.php on line 42