Get current url including query string in wordpress

get-current-page-url-with-query-string.php

/**
 * Get current page url with query string
 * @since 1.0.0
 * @return: full url of your current page with query string
 * @use: echo get_current_page_url(); 
*/
if ( ! function_exists( 'get_current_page_url_with_query_string' ) ) {
	function get_current_page_url_with_query_string() {
		global $wp;
		return add_query_arg( $_SERVER['QUERY_STRING'], '', home_url( $wp->request ) );
	}
}