Doubling number each loop?

[richiejones24]

I need to double a number each loop but cant find a way to do it, so eg,  500, 1000,2000,4000 ect

[sunfighter]

<?php
$number = 3;

for($i = 0; $i < 50; $i++)
{
$number = 2 * $number;
echo $number . '<br />';
}
?>

[Zane]

There's also a multiplication assignment operator..

*=

 

so you can easily just say

$number *= 2;