3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function g($current_day, $delay) { if(($current_day+$delay) > 5) return (min(($current_day+($delay)), 5)%5)+1; else return $delay; } function f($current_day, $delay) { return $current_day-(((min($current_day, 5)+($delay-1))%5)+1); } for($i = 1; $i < 8; $i++) printf("\tf(%d, 1) => %d\n", $i, f($i, 1)); printf("\n\n\n\n"); for($i = 1; $i < 8; $i++) printf("\tf(%d, 2) => %d\n", $i, f($i, 2));
based on SGhgd
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
f(1, 1) => -1 f(2, 1) => -1 f(3, 1) => -1 f(4, 1) => -1 f(5, 1) => 4 f(6, 1) => 5 f(7, 1) => 6 f(1, 2) => -2 f(2, 2) => -2 f(3, 2) => -2 f(4, 2) => 3 f(5, 2) => 3 f(6, 2) => 4 f(7, 2) => 5