<?php $arraySession = [ 'sampleA' => ['1', '2', '3'], 'sampleB' => ['1', '2', '3'], ]; $arrayPost = [ 'sampleA' => ['1'], 'sampleB' => ['1','2'], ]; var_export( array_reduce( array_keys($arraySession), fn($result, $k) => $result + [$k => array_diff($arraySession[$k], $arrayPost[$k] ?? [])], [] ) );
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