Display email address field next to author in wp_dropdown_users

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the post_author_meta_box uses wp_dropdown_users showing the user name of authors.
How do I display the email address in brackets next the author’s name?
Can one filter the wp_dropdown users do to this?

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  1. the only filter hook called in wp_dropdown_users() function is wp_dropdown_users which pass a string of the dropdown in an html form so you can manipulate this dropdown at that hook with some major REGEX.

    A better solution would be to use get_users() and create the dropdown your self, something like this:

    $selected = 1; //just for example, you can get that by get_post_meta()
$siteusers = get_users(); // you can pass filters and option
$re = '';
if (count($siteusers) > 0){
    $re = '<select name="users_with_email">';
    foreach ($siteusers as $user) {
        $re .= '<option value="' . $user->ID . '">'.$user->user_nicename . ' ('.$user->user_email .')</option>';
    }
    $re .= '</select>';
    $re = str_replace('value="' . $selected . '"','value="' . $selected . '" selected="selected"', $re );
}
echo $re;