mysql_errno Returns the numerical value of the error message from previous MySQL operation intmysql_errno resource link_identifier Returns the error number from the last MySQL function, or 0 (zero) if no error occurred. Errors coming back from the MySQL database backend no longer issue warnings. Instead, use mysql_errno to retrieve the error code. Note that this function only returns the error code from the most recently executed MySQL function (not including mysql_error and mysql_errno), so if you want to use it, make sure you check the value before calling another MySQL function. ]]> The above example would produce the following output: If the optional argument is specified the given link is used to retrieve the error code. If not, the last opened link is used. See also mysql_error and MySQL error codes.