how to make a series of number jumps based on the numbers of variables : <p>I want to make row of number jumps, example I have <code>$a = 1</code> and <code>$b = 2</code>. then I want loop $a and $b and the result is <code>$a = '1', '5', '9', '13', '17'</code> and <code>$b = '2', '6', '10', '14', '18'</code> . How to make it?</p>
