Loop and assign at random

I have two variable inputs $purchase and $lease which are integers

I want to total these (easy) and then apply a scenario at random to each based on the number for each type.

Example
$lease = 4;
$purchase = 2;
$total = $lease + $purchase; // 6

Loop through each 6 and apply 4 to scenario lease and 2 to lease at random.

In each loop I'll do something like add to a database or assign it into an array.

Any ideas of how I can do this.

Or another way to do with, I have 6 objects, 4 lease and 2 purchase (variable) how can I mix that list up randomly

I'm inclined to suggest:

$actions = array_merge(
    array_fill(0, $purchase, 'P'),
    array_fill(0, $lease, 'L')
);
shuffle($actions);

Now you loop over $actions and take the action corresponding to 'P' or 'L' on each iteration.

That'll work nicely.