hello.php

", "Hello World", "

"; $n = 20; echo "

Now I will calculate {$n}!

"; # note use of {} to embed a variable. $fac = 1; for ($i=1; $i <= $n; $i++) { # notice the C-style loop $fac = $fac*$i; echo "{$i}! = {$fac}
"; } ?>