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Fatal error: Uncaught ArgumentCountError: The number of variables must match the number of parameters in the prepared statement in ...

원인 :

php7/ch5/app/services/index.php : 14줄

[ 'username' => $username ] = first('SELECT username FROM users', $post['user_id']);

해결 :

[ 'username' => $username ] = first('SELECT username FROM users WHERE id = ?', $post['user_id']);