3v4l.org

run code in 300+ PHP versions simultaneously
<?php $amount = 1009.1; for($a = .5; $a < 20; $a + 0.5){ echo $amount . " = " . number_format(round($amount,-1)) . " " ; $amount = $amount + $a; }

preferences:
32.21 ms | 402 KiB | 5 Q