<?php $rotor = ["A" => "R", "B" => "D", "C" => "O", "D" => "B"]; $from = "C"; foreach (array_keys($rotor) as $index => $key) { if ($key === $from) { $rotor = array_slice($rotor, $index, null, true) + $rotor; break; } } var_export($rotor);
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