Below is the problems i get it in the "beginning PHP, Apache, MySQL Web Development"text book.

Warning:implode():Bad arguments in register.php on line 79
unknown column "city" in "field list".

The first one how can i solve it?I check many time but still cannot solve it.

The second is my database cannot recognize the "city"?

Thanks for help me solving the problems.

can u post the code and database structure