Decodes encoded header data passed from mime_header_decode().
Callback for preg_replace_callback() within mime_header_decode().
$matches: The array of matches from preg_replace_callback().
string The mime-decoded string.
function _mime_header_decode($matches) {
// Regexp groups:
// 1: Character set name
// 2: Escaping method (Q or B)
// 3: Encoded data
$data = $matches[2] == 'B' ? base64_decode($matches[3]) : str_replace('_', ' ', quoted_printable_decode($matches[3]));
if (strtolower($matches[1]) != 'utf-8') {
$data = drupal_convert_to_utf8($data, $matches[1]);
}
return $data;
}