Clickable phone number and mail in PHP [closed]

PHP Hello. I need to add clickable phone number and mail. Can You help?

  <?php if(!empty($header_email)): ?>
       <li><span>
         <i class="fa <?php echo esc_attr($header_email_icon);?>"></i></span>
           <?php echo esc_html($header_email);?></li>
                <?php endif; ?>
         <?php if(!empty($header_phone)): ?>
           <li><span><i class="fa <?php echo esc_attr($header_phone_icon);?>"></i></span>     <?php echo esc_html($header_phone);?></li>
                <?php endif; ?>

Should I add?

<a href="mail"><?php echo esc_html($header_email);?></a> 
<a href="tel"><?php echo esc_html($header_phone);?></a>

Regards