/**
* Converts an array of header values that may contain comma separated
* headers into an array of headers with no comma separated values.
*
* @param MessageInterface $message That contains the header
* @param string $header Header to retrieve from the message
*
* @return array Returns the normalized header field values.
*/
public static function normalizeHeader(MessageInterface $message, $header)
{
$h = $message->getHeaderAsArray($header);
for ($i = 0, $total = count($h); $i < $total; $i++) {
if (strpos($h[$i], ',') === false) {
continue;
}
foreach (preg_split('/,(?=([^"]*"[^"]*")*[^"]*$)/', $h[$i]) as $v) {
$h[] = trim($v);
}
unset($h[$i]);
}
return $h;
}
