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Lukas Albrecht
PLUS
Lukas Albrecht
Courses Plus Student 11,843 Points
Posted by Lukas Albrecht
Lukas Albrecht
Courses Plus Student 11,843 Points

Multiple Post Thumbnails and lightbox

I need help with implementing a lightbox to the featured image in a blog post. I use the Plugin "Multiple Post Thumbnails" to display more as one image for a blogpost. But I also need a lightbox for each image on a single view. 

<a  class="post-thumbnail" href="<?php  
        if ( is_single() ) :
            echo // ### What I have to paste here to get the image url? 
        else :
            echo esc_url( get_permalink());
        endif;
        ?>">
        <?php if (class_exists('MultiPostThumbnails')) : MultiPostThumbnails::the_post_thumbnail(get_post_type(), 'zweites-image'); endif; ?>
    </a>

What I have to paste in the first if-statement to get the image url? And is the Plugin "CSS3 Lightbox" the right choice?