PHP Increment by Half

Question

I have a quick question, which is probably easy to answer. I've goolged around, but not sure if I am searching correctly or what. Anyway, using PHP, how can I increment by halves?

For example, I know I can use the following loop:

<?php 
for ($i=1; $i<21; $i++) {
    print($i);
}

And it will print 1 - 20.

But, how can I get it to output something like the following:

1
1.5
2
2.5
etc...

Sorry for my ignorance on this, I'm just not sure how to go about it. Thanks!

Answer 1

instead of $i++, use $i += .5