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<?php $data = array('status.1', 'status.2', 'status.3', 'country.244', 'country.24', 'country.845', 'pm.4', 'pm.9', 'pm.6'); $groupedData = array_map(function($arg) { [$key, $val] = explode('.', $arg); return array($key => $val); }, $data); var_dump(array_column($groupedData, 'country'));

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