3v4l.org

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<?php foreach( range( 0, 20) as $c) { $mod = $c % 5; $input = ($mod < 3) ? $c - $mod : $c + (5 - $mod); echo $c . ' ' . $input . "\n"; }
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, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
0 0 1 0 2 0 3 5 4 5 5 5 6 5 7 5 8 10 9 10 10 10 11 10 12 10 13 15 14 15 15 15 16 15 17 15 18 20 19 20 20 20
preferences:
278.96 ms | 406 KiB | 456 Q