回复链接

<a class="comment-reply-link" href="/2013/12/29/hello-world/?replytocom=32#respond" 
 onclick="return addComment.moveForm(\'comment-32\', \'32\', \'respond\', \'1\')">Reply</a>

<a rel="nofollow" id="cancel-comment-reply-link" 
href="/2013/12/29/hello-world/#respond" style="">Cancel reply</a>

演示插件：

这是一个演示Comment Subject 插件：/wp-content/plugins/comment-subject/comment-subject.php:

<?php
/**
 * Plugin Name: Comment Subject
 */

/**
 * Add extra Subject comment field when there is no replytocom in the url 
 */
function additional_fields () {

    $url_query = parse_url( $_SERVER[\'REQUEST_URI\'], PHP_URL_QUERY );

    if( FALSE === stripos( $url_query, \'replytocom\' ) )
    { 
        echo \'<p class="comment-form-subject">\'.
        \'<label for="subject">\' . __( \'Your subject\' ) . \'</label>\'.
        \'<input id="subject" name="subject" type="text" size="30"  tabindex="5" /></p>\';
    }
}

add_action( \'comment_form_logged_in_before\', \'additional_fields\' );
add_action( \'comment_form_before_fields\', \'additional_fields\' ); 

/**
 * Add jQuery and load the custom "script.js"
 */    
function custom_scripts() 
{
    wp_enqueue_script( \'jquery\' );

    wp_enqueue_script(  \'my-comment-subject\', 
                            plugins_url( \'js/script.js\' , __FILE__ ), 
                            array( \'jquery\' ), 
                            \'1.0.0\', 
                            TRUE 
                     );

}

add_action( \'wp_enqueue_scripts\', \'custom_scripts\' );

jQuery(document).on( \'click\', \'a.comment-reply-link\', function( event ) {
    jQuery(\'p.comment-form-subject\').hide();
});

jQuery(document).on( \'click\', \'a#cancel-comment-reply-link\', function( event ) {
    jQuery(\'p.comment-form-subject\').show();
});

让我来介绍一个简单的CSS专用解决方案：

/* Hide the subject for nested comments (level 2 and below) */
.comment .comment p.comment-form-subject {
    display: none;
}

使用条件检查是否有注释如何？如果没有，则显示其他注释表单。

$num_comments = get_comments_number( $post_id );
if($num_comments > 0) {
    // Your function to edit comment fields if there ARE comments. Or nothing if the default fields are fine.
}
else
{
//We have comments, so run your function, as above.
add_action( \'comment_form_logged_in_before\', \'additional_fields\' );
add_action( \'comment_form_before_fields\', \'additional_fields\' ); 

function additional_fields () {
    echo \'<p class="comment-form-subject">\'.
    \'<label for="subject">\' . __( \'Your subject\' ) . \'</label>\'.
    \'<input id="subject" name="subject" type="text" size="30"  tabindex="5" /></p>\';
}
} //End else

在单曲中使用此片段。php，将其粘贴在while循环之前的注释打开函数中，这将得到您的解决方案。

$args = array( \'post_id\' => $post->ID,\'count\' => true );
 $comments = get_comments($args);

 if( $comments == 0  ) :
    add_action( \'comment_form_logged_in_before\', \'additional_fields\' );
    add_action( \'comment_form_before_fields\', \'additional_fields\' );
 endif;

 function additional_fields () {
    echo \'<p class="comment-form-subject">\'.
    \'<label for="subject">\' . __( \'Your subject\' ) . \'</label>\'.
    \'<input id="subject" name="subject" type="text" size="30"  tabindex="5" /></p>\';
 }