Untitled Snippet

add_filter( 'aioseo_robots_meta', 'aioseo_filter_robots_meta' );

function aioseo_filter_robots_meta( $attributes ) {

	$url = home_url( $_SERVER['REQUEST_URI'] );

	if (strpos($url,'product_search=') !== false) {

		$attributes['index'] = "noindex";

	};

	return $attributes;

}