PHP: How do I enable error reporting?

he following enables all errors:

ini_set('display_errors',1);
ini_set('display_startup_errors',1);
error_reporting(-1);

See


http://php.net/manual/en/errorfunc.configuration.php#ini.display-errors
http://php.net/manual/en/errorfunc.configuration.php#ini.display-startup-errors
http://php.net/manual/en/function.error-reporting.php