Hello, >From php manual: $a << $b Shift leftShift the bits of $a $b steps to the left (each step means "multiply by two") $a >> $b Shift rightShift the bits of $a $b steps to the right (each step means "divide by two") So i ask what this output? $a = 4; $b = 3; echo $a << $b; echo $a >> $b; Angelo -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php