仅在通过自定义字段添加内容时显示<li>

我已经讨论了其他一些类似的话题，但任何解决方案都不适合我。

基本上，如果自定义字段中添加了信息，我只想显示一个。

这是我的代码，即使你没有给我一个答案，你能告诉我正确的方向吗。

<div class="height">
<div class="fourcol">
<p class="business"><?php the_field(\'helpline_name\'); ?></p>                                                       <div class="category"><p>AREAS OF HELP: <?php the_category(\', \') ?></p> </div>
                                            <p><?php the_field(\'helpline_address\'); ?></p>
</div>
<div class="fivecol">
<p class="phone"><?php the_field(\'helpline_phone_number\'); ?></p>
                                                   </div>                       
<div class="threecol last">
                                              <ul>
                                            <li><a href="http://<?php echo the_field(\'helpline_url\'); ?>" class="tiptip web" title="<?php echo the_field(\'helpline_url\'); ?>" target="_blank"><?php echo the_field(\'helpline_url\'); ?></a></li>
                                            <li><a href="" class="tiptip comments" title="read comments from others" target="_blank"><?php echo the_field(\'helpline_comments\'); ?></a></li>
                                            <li><a href="mailto:<?php echo the_field(\'helpline_email\'); ?>" class="tiptip email" title="email us your problem"><?php echo the_field(\'helpline_email\'); ?></a></li>
                                        </ul>

提前谢谢Tyler

<li><a href="http://<?php echo the_field(\'helpline_url\'); ?>" class="tiptip web" title="<?php echo the_field(\'helpline_url\'); ?>" target="_blank"><?php echo the_field(\'helpline_url\'); ?></a></li>

<?php if ( the_field( \'helpline_url\' ) ) { ?> <li><a href="http://<?php echo the_field(\'helpline_url\'); ?>" class="tiptip web" title="<?php echo the_field(\'helpline_url\'); ?>" target="_blank"><?php echo the_field(\'helpline_url\'); ?></a></li> <?php } ?>

<?php if( empty(the_field(\'helpline_url\')) ) : ?> <li> <a href="http://<?php echo the_field(\'helpline_url\'); ?>" class="tiptip web" title="<?php echo the_field(\'helpline_url\'); ?>" target="_blank"> <?php echo the_field(\'helpline_url\'); ?> </a> </li> <?php endif; ?>

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