Use Post Categories as Keyword

Hello,

Thank you for contacting Rank Math and bringing your concern to our attention.

You can use the following filter on your site to automatically use your post categories as the focus keyword:

function update_focus_keywords() {
	$posts = get_posts(array(
	'posts_per_page'	=> -1,
	'post_type'		=> 'post' //replace post with the name of your post type
    ));
	foreach($posts as $p){
		if(get_the_category($p->ID)){
			foreach((get_the_category($p->ID)) as $category) {
                $keywords[] = strtolower($category->name);
            }
		update_post_meta($p->ID,'rank_math_focus_keyword',implode(", ", array_unique($keywords)));
		}
	}
    
}
add_action( 'init', 'update_focus_keywords' );

Here is a guide you can follow to add this filter:
https://rankmath.com/kb/wordpress-hooks-actions-filters/

Let us know how it goes.

Thank you.

​​​​​​​

Hello,

In the filter, this line reads/process all your posts, which can slow down your site and throw the error:
'posts_per_page' => -1

However, you can limit the number of posts that you process each time by setting a limit on the posts like so:

'posts_per_page' => 100

You can then add an offset to the function as well to continue adding the focus keywords to newer posts. So, after changing the first 100 posts you add an offset of 100 to the function like so:

'offset' => 100

You can continue to increase the offset by 100 until it runs through all of the posts.

Each time you run the function, you can add 100 to the offset value like,

1st time : 'offset' => 0, 
2nd time : 'offset' => 100,
3rd time : 'offset' => 200,

And so on…

I hope that helps.

Thank you.

Hello,

We trigger this with the init action but you can try to run the function to update the focus keywords during the save_post method and only use it for the current post being saved.

This sort of high-level modifications are outside the scope of our support so you would need to hire a developer to change the filter if you don’t feel familiar with PHP coding.

Don’t hesitate to get in touch if you have any other questions.

Hello,

Glad that everything has been sorted out.

Please feel free to reach out to us again in case you need any other assistance.

We are here to help.

Thank you.