+ $compatFilename = mb_convert_encoding( $filename, 'ISO-8859-1' );
+ if ( preg_match( '/^[0-9a-zA-Z!#$%&\'*+\-.^_`|~]+$/', $compatFilename ) ) {
+ $header .= '; filename=' . $compatFilename;
+ } else {
+ $header .= '; filename="'
+ . preg_replace( '/([\0-\x1f"\x5c\x7f])/', '\\\\$1', $compatFilename ) . '"';
+ }
+ if ( $compatFilename !== $filename ) {
+ $value = "UTF-8''" . rawurlencode( $filename );
+ // rawurlencode() encodes more characters than RFC 5987 specifies. Unescape the ones it allows.
+ $value = strtr( $value, [
+ '%21' => '!', '%23' => '#', '%24' => '$', '%26' => '&', '%2B' => '+', '%5E' => '^',
+ '%60' => '`', '%7C' => '|',
+ ] );
+ $header .= '; filename*=' . $value;
+ }
+ $this->getMain()->getRequest()->response()->header( $header );