Here's what I've decided to use: <?php $days = [ 1 => 'M', 2 => 'T', 3 => 'W', 4 => 'TH', 5 => 'F', 6 => 'S', 7 => 'Su', 8 => 'Online', ]; $classDays = [1,3]; if(count($classDays)=='0') { $classDays = [8]; } $result = array_map(function ($a) use($days) { return $days[$a]; }, $classDays); echo implode(', ', $result);

@KIKOSoftware The result could contain any number of days and the output will be in numerical order. I've added the checkbox HTML to my post. Thanks.

@KIKOSoftware No worries. In the posted example, I expect the output to be M W F. If the user doesn't select any options when selecting the checkboxes on the input form, they will be assigned the Online value.

@SᴀᴍOnᴇᴌᴀ - You've summed it up :) Primarily, my code seems repetitive so I would think it would be better to loop, but I'm not sure of the best way to go about that.

@KIKOSoftware - 3v4l.org/Sghnh#v7.4.30 is the link I posted and there isn't an error. The link you posted is missing the values for $classDays.

Thank you so much! Your post has lots of great information that I've spent the past couple days working on. I've learned a lot, so thank you! :)

Thanks for the link Sam, I read it over. I also updated my code, so hopefully I can get some feedback on my changes. Thank you.