db2_conn_errormsg returns an error message and SQLCODE value representing the reason the last database connection attempt failed. As db2_connect returns false in the event of a failed connection attempt, do not pass any parameters to db2_conn_errormsg to retrieve the associated error message and SQLCODE value.
If, however, the connection was successful but becomes invalid over time, you can pass the connection parameter to retrieve the associated error message and SQLCODE value for a specific connection.
A connection resource associated with a connection that initially succeeded, but which over time became invalid.
Returns a string containing the error message and SQLCODE value resulting from a failed connection attempt. If there is no error associated with the last connection attempt, db2_conn_errormsg returns an empty string.