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  • I’m afraid I don’t quite understand the solution.

    Use case (refined) is:

    jumbotron_horizontal_alignment could be either “Left” or “Centre”.

    • If “Centre”, write out “d-flex text-center justify-content-center” (which is three classes) in to my HTML
    • If “Left”, do nothing (there are no classes associated with left alignment, since it is the default.

    I modified like this…

            if (get_field('jumbotron_horizontal_alignment') = 'Centre') {
              echo 'd-flex text-center justify-content-center';

    … But WordPress threw this…

    Fatal error: Can't use function return value in write context in /home/mysite/public_html/wp-content/themes/mytheme/page.php on line 32