<?php $values = [ [ ["id" => 1], ["id" => 3], ["id" => 8] ], [ ["id" => 1] ], [ ["id" => 3], ["id" => 2] ] ]; $unique_ids = array_column(array_merge(...$values), "id", "id"); sort($unique_ids); var_export($unique_ids); echo "\n\n"; foreach ($values as $groups) { foreach ($groups as $rows) { $result[$rows["id"]] = $rows["id"]; } } sort($result); var_export($result);
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