public function splitHttpAcceptHeader($header)
{
$values = array();
foreach (array_filter(explode(',', $header)) as $value) {
// Cut off any q-value that might come after a semi-colon
if ($pos = strpos($value, ';')) {
$q = (double) trim(substr($value, strpos($value, '=') + 1));
$value = substr($value, 0, $pos);
} else {
$q = 1;
}
if (0 < $q) {
$values[trim($value)] = $q;
}
}
arsort($values);
return array_keys($values);
}