3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php while($alfabet<21) {echo $alfabet; $alfabet++;} ?>
based on dGOKE
Output for 5.0.4 - 7.2.0
Notice: Undefined variable: alfabet in /in/70jcL on line 2 Notice: Undefined variable: alfabet in /in/70jcL on line 3 Notice: Undefined variable: alfabet in /in/70jcL on line 4 1234567891011121314151617181920
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: alfabet in /in/70jcL on line 2 Notice: Undefined variable: alfabet in /in/70jcL on line 3 Notice: Undefined variable: alfabet in /in/70jcL on line 4 1234567891011121314151617181920