3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function f($current_day, $delay) { return ((($current_day+$delay)%5)+1); } for($i = 1; $i < 8; $i++) { printf("f(%i, 1) => $i", $i, f($i, 1)); }
based on XnM3j
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
f(, 1) => 1f(, 1) => 2f(, 1) => 3f(, 1) => 4f(, 1) => 5f(, 1) => 6f(, 1) => 7