Is there a way to execute a custom PHP script inside a meta field?

Hello,

Thank you for contacting Rank Math today.

Yes this is possible, you can create a custom variable replacement that lists all the taxonomy terms using the following filter:

/**
 * Filter to add custom variables
 */
add_filter( 'rank_math/vars/replacements', function( $vars ) {
 return $vars;
});

Looking forward to helping you. Thank you.

​​​​​​

HI Rogerio,

Thanks for the follow up.

Yes this will go in your theme’s functions.php file but you will need to come up with some additional arguments to get the products categories and return them when this variable is called.
Here is an example of how this would look:

add_action( 'rank_math/vars/register_extra_replacements', function() {
   RankMath\Helper::register_var_replacement( 'Category_list',array('Rank_math_list_cats'),$args = array(
	        'name'    => esc_html__( 'List of categories', 'rank-math' ),
			'desc'    => esc_html__( 'Categories from products', 'rank-math' ),
			'example' => esc_html__(Rank_math_list_cats())));
	
	
} );

function Rank_math_list_cats(){
	    $list = array();
        $orderby = 'name';
        $order = 'asc';
        $hide_empty = false ;
        $cat_args = array(
           'orderby'    => $orderby,
           'order'      => $order,
           'hide_empty' => $hide_empty,
        );
 
        $product_categories = get_terms( 'product_cat', $cat_args );
      
        if( !empty($product_categories) ){
    
        foreach ($product_categories as $key => $category) {
        $list[] = $category->name;
        }
        }
	    $cat_list = implode(", ",$list);
	    return $cat_list;
	

}

The code above registers a variable called %Category_list% that will display a comma separated list of categories.

I hope this info helps. Thank you.