I think it would be useful in some situation if the range() function can take a third optional parameter (called "step" or whatever you want) which specifies the space between two consecutive elements in the resulting array. For example:

$array = range(1, 5, 2); // array(1,3,5);

It might be always positive to understand its effect easily.

$array = range('Z', 'A', 3); // array('Z', 'W', 'T', 'Q', ...);

If the second boundary cannot be included regarding to the step parameter, just simply leave it out:

$array = range(1, 6, 2); // array(1,3,5);


That's all.