PHP Warning: mysqli_stmt::bind_param(): Number of variables doesn't match number of parameters in prepared statement

Question

Not sure why I\'m getting this PHP warning message. It appears there are four parameters in the prepared statement, and also four variables in bind_param(). Thanks for any

Answer 1

You do not need to bind parameters in this case. Placeholders are used for the values in an INSERT statement, or in a WHERE clause. (Note that placeholders are not allowed for identifiers, such as the column names in your statement.) A valid, simplified statement with placeholders would look like:

"SELECT url, cover_image FROM back_issues WHERE month = ? and year = ?"