(PHP 4 = 4.0.6) Returns the error number from the last fbsql function, or 0 (zero) if no error occurred. Errors coming back from the fbsql database backend dont issue warnings. Instead, use fbsql_errno() to retrieve the error code. Note that this function only returns the error code from the most recently executed fbsql function (not including fbsql_error() and fbsql_errno()), so if you want to use it, make sure you check the value before calling another fbsql function. fbsql_error(), fbsql_warnings() も参照下さい。