f="#zip_file_extra_field_get_by_id"><code class="Fn">zip_file_extra_field_get_by_id</code></a>()
    function returns the extra field with ID (two-byte signature)
    <var class="Ar">extra_field_id</var> and index
    <var class="Ar">extra_field_index</var> (in other words, the
    <var class="Ar">extra_field_index</var><span class="No">'th</span> extra
    field with ID <var class="Ar">extra_field_id</var>) The other arguments are
    the same as for <code class="Fn">zip_file_extra_field_get</code>().</p>
