3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function fantastic3($n) { $a=array(); $a[0]=0; $a[1]=1; $a[2]=1; for($i=3;$i<$n;$i++){ $a[$i]=$a[$i-1]+$a[$i-2]+$a[$i-3]; } return $a[$n]; } echo fantastic3(5); ?>
Output for 5.3.0 - 5.6.28, 7.0.0 - 7.1.0
Notice: Undefined offset: 5 in /in/JZXn9 on line 13
Output for hhvm-3.12.0
Notice: Undefined index: 5 in /in/JZXn9 on line -1
Output for hhvm-3.10.0
Notice: Undefined index: 5 in /in/JZXn9 on line 13
Output for 4.3.0 - 5.2.17
Notice: Undefined offset: 5 in /in/JZXn9 on line 13