我想你对如何comment_form 作品那么让我们看看（这是wp-includes/comment-template.php):

<?php
function comment_form( $args = array(), $post_id = null ) {
    // snip snip 
    $fields =  array(
        \'author\' => \'<p class="comment-form-author">\' . \'<label for="author">\' . __( \'Name\' ) . \'</label> \' . ( $req ? \'<span class="required">*</span>\' : \'\' ) .
                    \'<input id="author" name="author" type="text" value="\' . esc_attr( $commenter[\'comment_author\'] ) . \'" size="30"\' . $aria_req . \' /></p>\',
        \'email\'  => \'<p class="comment-form-email"><label for="email">\' . __( \'Email\' ) . \'</label> \' . ( $req ? \'<span class="required">*</span>\' : \'\' ) .
                    \'<input id="email" name="email" type="text" value="\' . esc_attr(  $commenter[\'comment_author_email\'] ) . \'" size="30"\' . $aria_req . \' /></p>\',
        \'url\'    => \'<p class="comment-form-url"><label for="url">\' . __( \'Website\' ) . \'</label>\' .
                    \'<input id="url" name="url" type="text" value="\' . esc_attr( $commenter[\'comment_author_url\'] ) . \'" size="30" /></p>\',
    );

    $required_text = sprintf( \' \' . __(\'Required fields are marked %s\'), \'<span class="required">*</span>\' );
    $defaults = array(
        \'fields\'               => apply_filters( \'comment_form_default_fields\', $fields ),
        \'comment_field\'        => \'<p class="comment-form-comment"><label for="comment">\' . _x( \'Comment\', \'noun\' ) . \'</label><textarea id="comment" name="comment" cols="45" rows="8" aria-required="true"></textarea></p>\',
        \'must_log_in\'          => \'<p class="must-log-in">\' . sprintf( __( \'You must be <a href="%s">logged in</a> to post a comment.\' ), wp_login_url( apply_filters( \'the_permalink\', get_permalink( $post_id ) ) ) ) . \'</p>\',
        \'logged_in_as\'         => \'<p class="logged-in-as">\' . sprintf( __( \'Logged in as <a href="%1$s">%2$s</a>. <a href="%3$s" title="Log out of this account">Log out?</a>\' ), admin_url( \'profile.php\' ), $user_identity, wp_logout_url( apply_filters( \'the_permalink\', get_permalink( $post_id ) ) ) ) . \'</p>\',
        \'comment_notes_before\' => \'<p class="comment-notes">\' . __( \'Your email address will not be published.\' ) . ( $req ? $required_text : \'\' ) . \'</p>\',
        \'comment_notes_after\'  => \'<p class="form-allowed-tags">\' . sprintf( __( \'You may use these <abbr title="HyperText Markup Language">HTML</abbr> tags and attributes: %s\' ), \' <code>\' . allowed_tags() . \'</code>\' ) . \'</p>\',
        \'id_form\'              => \'commentform\',
        \'id_submit\'            => \'submit\',
        \'title_reply\'          => __( \'Leave a Reply\' ),
        \'title_reply_to\'       => __( \'Leave a Reply to %s\' ),
        \'cancel_reply_link\'    => __( \'Cancel reply\' ),
        \'label_submit\'         => __( \'Post Comment\' ),
    );

    $args = wp_parse_args( $args, apply_filters( \'comment_form_defaults\', $defaults ) );

        // $args get used to fill out the fields here
}

只需重写要更改的参数。如果需要自定义字段，只需传入字段，无需使用钩子comments_form_default_fields.

过于简化的示例：

<?php comment_form(array(
    \'fields\'    => array(
        \'author\' => \'<input type="text" name="author" />\',
        \'location\' => \'<input type="text" name="location" />\',
    ),
));

WordPress将负责保存作者字段，但要保存位置，您还需要做更多的工作。我写了一个tutorial about this.

基本上：钩入comment_post. 检查$_POST 对于字段，保存它：

<?php
add_action( \'comment_post\', \'wpse69222_insert_comment\', 10, 1 );
function wpse69222_insert_comment( $comment_id )
{
    // prolly should do more validation here?
    if( isset( $_POST[\'location\'] ) )
        update_comment_meta( $comment_id, \'location\', esc_attr( $_POST[\'location\'] ) );
}

您可能还需要管理区域字段和从管理员处编辑该位置的方法，但这是另一个问题。