Modal popup

<div class="modal fade" id="modal_a" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">
  <div class="modal-dialog" role="document">
    <div class="modal-content">
       <div class="modal-header">
        <h3 class="modal-title" id="exampleModalLabel"><?php the_title(); ?></h3>
        <button type="button" class="close" data-dismiss="modal" aria-label="Close">
          <span aria-hidden="true">&times;</span>
        </button>
      </div>
      <div class="modal-body">
           <p><?php the_content(); ?></p>
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
       
      </div>
    </div>
  </div>
</div>


<a href="" data-toggle="modal" data-target="#modal_a">
                      <?php the_title(); ?>
                  </a>