3v4l.org

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<?php $seats = 7; $booked_seat = array('1','4','5','6','7'); $booked_a = array_flip($booked_seat); for ($i=1; $i <= $seats; $i++) { printf("seat: %d%s\n", $i, isset($booked_a[$i]) ? " booked" : ""); }
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 - 5.5.37, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.29, 8.2.0 - 8.2.21, 8.3.0 - 8.3.9
seat: 1 booked seat: 2 seat: 3 seat: 4 booked seat: 5 booked seat: 6 booked seat: 7 booked

preferences:
254.87 ms | 406 KiB | 358 Q