3v4l.org

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<?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)); }
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
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

preferences:
263.39 ms | 405 KiB | 307 Q