register_action( 'wp_smush_post_cache_flush_required', array( $this, 'clear_post_cache' ) ); $this->register_action( 'wp_smush_home_cache_flush_required', array( $this, 'clear_url_cache' ) ); } public function should_run() { return parent::should_run() && function_exists( 'wpsc_delete_post_cache' ); } public function clear_post_cache( $post_id ) { if ( function_exists( 'wpsc_delete_post_cache' ) ) { wpsc_delete_post_cache( $post_id ); } } public function clear_url_cache( $url ) { if ( function_exists( 'wpsc_delete_url_cache' ) ) { wpsc_delete_url_cache( $url ); } } }