[kh99]

I think you can either provide a string to log, like

log_cron_action("Id is " . $logging['id'], $nextitem);

or else you can use a phrase (which has to be named task_varname_log, where varname is the actual varname of your task), and you can pass either one parameter to the phrase, or an array of parameters. So you could call it like this:

log_cron_action('', $logging['id'], $nextitem);

and then make a phrase something like "Id is {1}".

(FYI I got this by looking at the code, but I haven't actually tried it).