2

How do I count only the post that have a specific custom meta field value?

$productCount = wp_count_posts('product');
echo $productCount->publish;

That gives me all the total of all the post.

How do I find out how many of those post have say a custom meta value of cat?

8

There is no default/native function in wordpress to count posts from a specific meta value. wp_count_posts only counts the amount of posts according to post type

It might be useful here to use WP_Query to create a custom query to get all posts with that specific meta value and then use $wp_query->found_posts to get the post count.

This should do it

 $query = new WP_Query( array( 'meta_key' => 'color', 'meta_value' => 'blue' ) );

   echo $query->found_posts;

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