<?php $array = ['a' => 0, 'b' => 2, 'c' => 1, 'd' => 2, 'e' => 3]; $keys = array_keys($array); foreach ($keys as $i => $key) { if ($array[$key] > ($array[$keys[$i - 1]] ?? $array[$keys[$i + 1]] ?? $array[$key] - 1) && $array[$key] > ($array[$keys[$i - 1]] ?? $array[$keys[$i - 1]] ?? $array[$key] - 1) ) { $result[$key] = $array[$key]; } } var_export($result);
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