CommandResult

Return a CommandResult as the result of a command to pass both an exit code and result data from a command.

Usage:

 return CommandResult::dataWithExitCode(new RowsOfFields($rows), 1);

The CommandResult can also be used to unambiguously return just an exit code or just output data.

Exit code only:

 return CommandResult::dataWithExitCode(1);

Data only:

 return CommandResult::data(new RowsOfFields($rows));

Historically, it has always been possible to return an integer to indicate that the result is an exit code, and other return types (typically array / ArrayObjects) indicating actual data with an implicit exit code of 0. Using a CommandResult is preferred, though, as it allows the result of the function to be unambiguously specified without type-based interpretation.