<?php $array = ['A', 'A', 'B', 'B', 'C', 'A', 'A']; $result = []; foreach ($array as $v) { if (!isset($ref[$v])) { unset($ref); $ref[$v] = 1; $result[$v][] =& $ref[$v]; } else { ++$ref[$v]; } } var_export($result);
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