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<?php $test = "A.B.C"; $output = array(); $keys = explode('.', $test); $arr = &$output; while ($key = array_shift($keys)) { $arr = &$arr[$key]; } unset($arr); print_r($output);
Output for 5.5.0 - 5.5.35, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
Array ( [A] => Array ( [B] => Array ( [C] => ) ) )

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