VERY basic function question

["William Stokes" <kalles@xxxxxxxxxxxxx>]

I'm trying to learn functions (just started). I can't see why this fails:
<?php
function count($var)
{
if ($var == 10){
$result = $var + 10;
return $result;
}
else {
$result = $var + 20;
return $result;
}
}
$setvar = 10;
count($setvar);
echo "$result";
?>

I probably just didn't understand my manual. Any ideas?

Thanks
-Will 

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