Filling an array with numbers sequentially

Question

I have a number (e.g. 6) that is dynamically generated and I would like to fill an array with the numbers 1 through the dynamically generated number (in this example, 6):

Answer 1

Use range:

$arr = range(1,6);
// Returns an array of elements from start to limit, inclusive.

Answer 2

This is what you are looking for:

range(1, 6)