I am working on my header navigation and I want to underline the menu item for certain conditions.

I would like to add a CSS class if

  • the post has the ID 21638, or
  • the post has the meta value 'bloom'

The meta value is an ACF relationship field.

<nav class="header-navigation">
<ul class="header-navigation__list">
    <li <?php if (is_single(21638)) or (metadata_exists('bloom') echo 'class="current-menu-item"' ?>><a href="<?php echo site_url('/labels/bloom') ?>">Bloom</a></li>

I managed to solve the post ID part, but how do I add condition regarding meta value?

  • 2
    Did you try changing or to ||? and you have a parenthesis in the wrong place. it should be if ( is_single(21638) || (metadata_exists('bloom') )
    – rudtek
    Dec 23, 2022 at 5:54
  • I've replaced the code with <?php if ( is_single(21638) or (metadata_exists('bloom') ) ) echo 'class="current-menu-item"' ?>. VSCode accepts it but I receive an Parse error: syntax error, unexpected 'echo' (T_ECHO) Dec 25, 2022 at 20:19

1 Answer 1


The good thing about ACF is it comes with lots of functions to check fields. Here is the manual. Are you creating a meta value in addition to the field and it's value? I'm guessing that you are looking for the value of the bloom field. If that's so then get_field('bloom',post->ID) should be what you're looking for. Also as rutec pointed out you closed your if parentheses before the second eval. I'm surprised that doesn't throw an error.

  • Hi Alex. I am building my website which displays a couple of record labels and dozens of albums. When you are on a label page, you can see all albums, that have been released under this label. To achieve that, I have setup two CPT's. The first is "labels" where each label is represented by a post. The second CPT is "albums". Every album has an ACF, relationship field where the related label has to be selected. Dec 25, 2022 at 20:31
  • In my header navigation, I have a link to the label "Bloom". When you are on it, ( is_single(21638), the CSS class is being echoed. I also want the class to be echoed on all "albums" posts that are related to "Bloom", i.e. that have the meta vale "Bloom". I had a look at the manual... Do I somehow have to create an object to achieve that? Dec 25, 2022 at 20:36
  • The advanced custom field "record label" has a value of "Bloom"? What do you mean by "meta vale "Bloom""?
    – Alex T.
    Dec 25, 2022 at 22:31
  • $value = get_field( "record_label" ); if ($value == "Bloom")...
    – Alex T.
    Dec 25, 2022 at 22:38

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