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  • Ahh I used to be one too, then I became both after a while 😉 It’s inevitable in a small business

    Anyway, this should do it provided that both fields are arrays!

    
    <?php 
    $checkboxValues = get_field('field_name'); //Change field_name to your checkbox field
    $morecheckboxValues = get_field('field_name_2'); //Change field_name to your checkbox field
    $extraClasses = array_merge($checkboxValues, $morecheckboxValues);
    ?>
    <?php post_class( $extraClasses ); //This goes in your <article> element (or whatever you use) ?>