Target a specific instance of the shortcode in the filter hooks about wordpress-ajax-filter-posts HOT 1 CLOSED

/**
 * Add the diet term on all the queries made with the shortcode ajax_filter_posts
 *
 * @param array $query_args 			query arguments set by the plugin Ajax Filter posts
 * @param array $shortcode_attributes 	all shortcode attributes
 *
 * @return array a updated list of query arguments
 */
function my_site_set_additional_term_for_ajax_filter_posts($query_args, $shortcode_attributes) {
    
    // Only show posts with the term vegan in the diet taxonomy for the shortcode with the id only-vegan-recipes
    if (!empty($shortcode_attributes['id']) && $shortcode_attributes['id'] === 'only-vegan-recipes') {
        $diet_tax_query_args = [
            [
                'taxonomy' => 'diet',
                'field'    => 'slug',
                'terms'    => 'vegan',
            ],
        ];

        // If there are already tax queries args set, merge my query args with the set args
        if ( !empty( $query_args['tax_query'] ) ) {
            $prev_set_tax_args = $query_args['tax_query'];
            $query_args['tax_query'] = [
                // Set the relationship to AND: we want only post with my term and the set terms by the user
                // Also see https://developer.wordpress.org/reference/classes/wp_query/#taxonomy-parameters
                'relation' => 'AND',
                $diet_tax_query_args,
                $prev_set_tax_args
            ];
            return $query_args;
        }

        // If there are no tax queries args already set, just add it
        $query_args['tax_query'] = $diet_tax_query_args; 
    }
	
	return $query_args;
}
add_filter('ajax_filter_posts_query_args', 'my_site_set_additional_term_for_ajax_filter_posts', 10, 2);