wordpress add field to post_class

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I need to add a custom field to my article post but not sure how to add an additional class to it.

Currently the classes get pulled through like this <?php post_class($classes); ?>.

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However I need to add a custom field to this as well. To demonstrate ive added a class= but this doesnt work as class= is being added twice. 

<?php post_class($classes); ?> class="<?php the_field( "size" ); ?>

So i need post_class and the_field to work together.

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3 comments

  2. You can do this with two different way,

    First:- Add following code in theme's functions.php file:

    This will add your class where post_class is called.

    function category_id_class($classes)
{
    global $post;
    if($post->post_type == 'post')
    {
        $classes[] = get_field( "size" );;
    }
    return $classes;
}
add_filter('post_class', 'category_id_class');

    Second:- Add this following code directly into your page:-

    $post_classes = get_post_class();
$post_classes= implode(' ', $post_classes);
echo 'class="'.$post_classes. the_field( "size" )'"';

    Hope this will help you little bit.

  3. So why you could not do like this:

    <?php post_class(the_field( "size" )); ?>

    Because it is working like this:

    <?php post_class('my_custom_class'); ?>