<?php function solution($set) { $diff = array_diff(range(1, max($set)), $set); sort($diff); return !isset($diff[0]) ? max($set) + 1 : ($diff[0] < 1 ? 1 : $diff[0]); } echo solution([39, 68, 47, 2, 19, 64]).PHP_EOL; echo solution([1, 3, 6, 4, 1, 2]).PHP_EOL; echo solution([1, 2, 3]).PHP_EOL; echo solution([-1, -3]).PHP_EOL;
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Value for `_results` contains invalid data `array`