Can I do something like this?
<input type="hidden" name="for_person[]" miltiple="multiple" value="<?php echo $request_control['personal_task']; ?>">
I guess not, cause output in value="" tag is "Array" of course.
You could use json_encode or serialize to produce a string outof the array and pass via the hidden input. At server you can get it back via json_decode or unserialize.
Like
<input type="hidden" name="for_person" value="<?php echo json_encode($request_control['personal_task']); ?>" />
or
<input type="hidden" name="for_person" value="<?php echo serialize($request_control['personal_task']); ?>" />
<input type="hidden" name="miltiple" value="<?php echo implode(',', $array); ?>">thenexplode()the value after it's submitted.