3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php // The magic three sequence is the sum of the previous three values minus 1. // // 0,1,1,1,2,3,5, function magicThree($n) { if ($n < 1) return; $n--; // To an index; $s = array(0,1,1,1); if ($n > 3) { for ($i = 4; $i <= $n; $i++) { $s[$i] = $s[$i-1] + $s[$i-2] + $s[$i-3] - 1; } } print $s[$n]; } magicThree(5); ?>
Output for 4.3.0 - 7.1.0
2