private function parseHeader(string $key, $value)
    {
        switch ($key) {
            case 'msgno':
                return (int) $value;
            case 'from':
            case 'to':
            case 'cc':
            case 'bcc':
            case 'reply_to':
            case 'sender':
            case 'return_path':
                /** @var \stdClass $address */
                foreach ($value as $address) {
                    if (isset($address->mailbox)) {
                        $address->host     = $address->host ?? null;
                        $address->personal = isset($address->personal) ? $this->decode($address->personal) : null;
                    }
                }

                return $value;
            case 'date':
            case 'subject':
                return $this->decode($value);
        }

        return $value;
    }
private function parseHeader(string $key, $value)
    {
        switch ($key) {
            case 'msgno':
                return (int) $value;
            case 'from':
            case 'to':
            case 'cc':
            case 'bcc':
            case 'reply_to':
            case 'sender':
            case 'return_path':
                /** @var \stdClass $address */
                foreach ($value as $address) {
                    if (isset($address->mailbox)) {
                        $address->host     = $address->host ?? null;
                        $address->personal = isset($address->personal) ? $this->decode($address->personal) : null;
                    }
                }

                return $value;
            case 'date':
            case 'subject':
                return $this->decode($value);
        }

        return $value;
    }
private function parseHeader ( string $ key , $ value ) { switch ( $ key ) { case 'msgno' : return ( int ) $ value ; case 'from' : case 'to' : case 'cc' : case 'bcc' : case 'reply_to' : case 'sender' : case 'return_path' : /** @var \stdClass $address */ foreach ( $ value as $ address ) { if ( isset ( $ address -> mailbox ) ) { $ address -> host = $ address -> host ?? null ; $ address -> personal = isset ( $ address -> personal ) ? $ this -> decode ( $ address -> personal ) : null ; } } return $ value ; case 'date' : case 'subject' : return $ this -> decode ( $ value ) ; } return $ value ; }
Parse header.

@param string $key
@param mixed  $value

@return mixed
Parse header .