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<?php $array = [ '2' => ['3' => ['56' => '2'], '6' => ['48' => '2']], '4' => ['4' => ['433' => '2', '140' => '2'], '8' => ['421' => '2', '140' => '2']], '5' => ['5' => ['88' => '4', '87' => '2']] ]; var_export( collect($array)->reduce(fn($result, $set) => $result + $set, []) ); echo "\n---\n"; var_export( collect($array)->mapWithKeys(fn($set) => $set)->toArray() );
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