PHP Question - Small Script Options

[Aush]

I have a very small script that I need help with. I'm learning PHP, and I can't figure out why this loop won't work. Please help! =]

Here it is:

<?PHP
$counter = 0;
$start = 1;

for($start; $start < 11; $start++) {
$counter = $counter++;
print $counter . "<BR>";
}

?>

It DOES work when I do this, however:

<?PHP
$counter = 0;
$start = 1;

for($start; $start < 11; $start++) {
$counter = $counter + 1;
print $counter . "<BR>";
}

?>

I bolded the difference between the two. Thank you very much.

[Aush]

I thought it was supposed to add 1 everytime it looped.