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run code in 150+ php & hhvm versions
Bugs & Features
<?php function f($current_day, $delay) { return ((((min($current_day, 5))+($delay-1))%5)+1); } for($i = 1; $i < 8; $i++) { printf("f(%d, 1) => %d\n", $i, f($i, 1)); }
based on XRuS7
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
f(1, 1) => 2 f(2, 1) => 3 f(3, 1) => 4 f(4, 1) => 5 f(5, 1) => 1 f(6, 1) => 1 f(7, 1) => 1
Output for hhvm-3.10.0

Process exited with code 153.