<?php $payload = ['a', 'b', 'c', 'd']; function permutations($payload) { if (empty($payload)) { return [[]]; } $results = []; foreach ($payload as $key => $value) { foreach (permutations(array_diff_key($payload, [$key => $value])) as $subarray) { $results[] = array_merge([$value], $subarray); } } return $results; } $permutations = array_map('implode', permutations($payload)); print_r($permutations);
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