Returns the error text of the most recently executed SQL Anywhere PHP function. Error messages are stored per connection.
If no $conn is specified, then sasql_error returns the last error message where no connection was available. For example, if you call
sasql_connect and the connection fails, then call sasql_error with no parameter for $conn to get the error message. If you want to obtain the corresponding SQL Anywhere error code value, use the sasql_errorcode