PHP mixed with html mixed with wordpress tags gets wrong output -


this question specific , of guys maybe easy answer. i'm struggling website client 2 hours. try explain possible. made use of custom fields in wordpress customer can add images products. show images in lightbox (with plugin lightbox plus): <a rel="lightbox[<?php the_field('actietitel'); ?>]" href="<?php the_field('productafbeelding2'); ?>"> </a> . when there no "productafbeelding2 example, html still creat lightbox it's value null keeps loading. i'm trying fix 'if-else-statement' says: 

    <?php       if(the_field('actie-afbeelding2') != null)     "<a rel='lightbox[" . the_field('actietitel');  "]' href='" . the_field('actie-afbeelding2') .  "'> </a>"                                                            ?>

but reason won't work (this hundreds attempt sorry if bad part of code). actually, works returns url , not in lightbox. first piece of code showed return link in lightbox.

you can see at: http://www.bgc-testomgeving.nl/jorn/ambachtelijk/

hope guys can me!

ps: i'm sorry grammar, suck @ it.

use code

<?php       if(isset(get_field('actie-afbeelding2') && get_field('actie-afbeelding2')!= "") {    echo "<a rel='lightbox[";    the_field('actietitel');      echo "]' href='";    the_field('actie-afbeelding2');    echo "'> </a>"; }                                                            ?>

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