src/Peach/Http/Header/CookieItem.php
public function format()
    {
        $data = $this->formatData();
        return ($this->options === null) ? $data : implode("; ", Arrays::concat($data, $this->options->formatOptions()));
    }
public function format()
    {
        $data = $this->formatData();
        return ($this->options === null) ? $data : implode("; ", Arrays::concat($data, $this->options->formatOptions()));
    }
Set-Cookie ヘッダーの値 ("Set-Cookie: " に続く文字列部分) を書式化します.

@return string Set-Cookie ヘッダーの値部分