<?
$int = 0.293847289472983; 
echo $int ."\n"; 
echo round($int,2) . "\n"; 
echo round((int)$int,2) . "\n"; 
echo round((float)$int,2) . "\n"; 
echo round((double)$int,2) . "\n"; 
?>
outputs on php 4.0.6: 
0.29384728947298 
0.29 
0 
0.29 
0.29 

however, using php 4.1.0, it outputs: 
0.29384728947298299761570206101168878376483917236328125 
0.289999999999999980015985556747182272374629974365234375 
0 
0.289999999999999980015985556747182272374629974365234375 
0.289999999999999980015985556747182272374629974365234375 

is this a bug, or a new 'feature' ? Closest report I found was http://marc.theaimsgroup.com/?l=php-dev&m=100750316722784&w=2 on the php-dev mailinglist.