<?php $data = ['status.1', 'status.2', 'status.3', 'country.244', 'country.24', 'country.845', 'pm.4', 'pm.9', 'pm.6']; $result = []; foreach ($data as $value) { [$prefix, $result[$prefix][]] = explode('.', $value, 2); } var_export($result);
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Value for `_results` contains invalid data `array`