Looping through with double variables
<p>I have two arrays with two sets of values in ($a[] and $b[])
I want to do something like the following:</p>

<p>$a[0] - $b[0]
$a[0] - $b[1]</p>

<p>$a[1] - $b[0]
$a[1] - $b[1]</p>

<p>This will continue until the arrays reach the end. 
So i want a hyphen to seperate the two arrays, with the first array staying the same until the second array has looped through.</p>

<p>I am trying to get this in a dropdown with option value.</p>

<p>How could i achieve this?
I never tried doing any loops with two varaibles like that before, I literally have no idea at all! 
Thankyou</p>
