PHP: How to put a variable in an array?
$args['post__in'] = array_merge($args['post__in'], explode(',', $tabs));Let's explain what I did so you may pick up a thing or two:
explode(',', $tabs)splits a string into pieces at a separator and puts that pieces in an array.array_merge($arr1, $arr2)will merge the two arrays.$args['post__in']will access an array element specified by a key.
Note that array_merge, in this case, will just append the values and you may end up with duplicate numbers. To get rid of duplicates just wrap the merge in array_unique. Like so:
$args['post__in'] = array_unique(array_merge($args['post__in'], explode(',', $tabs)));And of course, the trivial case when you just want to replace those numbers with brand new ones is
$args['post__in'] = explode(`,`, $tabs);