<?php $defaults = [ 'public' => 0, 'private' => 0, 'secret' => 0, ]; $db = [ 'User1' => [ 'public' => 1, 'private' => 1, 'secret' => 1, ], 'User2' => [ 'public' => 1, 'private' => 0, 'secret' => 0, ], 'User3' => [ 'public' => 0, 'private' => 1, 'secret' => 1, ], ]; $form = [ 'User1' => [ 'public' => 1, 'private' => 1, ], 'User2' => [ 'public' => 1, 'secret' => 1, ], 'User3' => [ 'private' => 1, 'secret' => 1, ], ]; $result = []; foreach ($form as $user => $row) { $new = array_replace($defaults, $row); if ($db[$user] != $new) { $result[$user] = $new; } } var_export($result);
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