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<?php $array = ['a', 'b', 'c']; print_r(array_slice($array, 0, 1)); // a print_r(array_slice($array, 1, 1)); // b print_r(array_slice($array, 2, 1)); // c print_r(array_slice($array, 3, 1)); // none print_r(array_slice($array, -1, 1)); // c print_r(array_slice($array, -2, 1)); // b print_r(array_slice($array, -3, 1)); // a print_r(array_slice($array, -4, 1)); // a !?
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.25, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 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 - 8.3.7
Array ( [0] => a ) Array ( [0] => b ) Array ( [0] => c ) Array ( ) Array ( [0] => c ) Array ( [0] => b ) Array ( [0] => a ) Array ( [0] => a )

preferences:
170.11 ms | 404 KiB | 239 Q