"; print_r($data); echo ''; } function arrayToXml($data, $root = 'xml') { $xml = "<{$root}>"; foreach ($data as $key => $value) { if (is_array($value)) { $xml .= arrayToXml($value, $key); } else { $xml .= "<{$key}>{$value}"; } } $xml .= ""; return $xml; } function growth_rate($a, $b) { if (!$a || !$b || ($a - $b == 0)) { return 0; } return round(($a - $b) / $b * 100, 2); }