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There are 2 problems. The first problem is this: if (is_single (‘^\d+$’)) { is_single can’t take a regex, it only takes: Post ID, title, slug, or array of such to check against. https://developer.wordpress.org/reference/functions/is_single/ So you could do this: is_single( ‘my-page’ ) for example, but in this case it would be better to do is_single() or … Read more