` tag with custom CSS if a favorite color is set * and the user is logged in. Returns an empty string if no conditions are met. */ function doDynamicStyling() :string { $dynamic_style = ""; if(isLoggedIn() && !empty($_SESSION["favorite_color"]) && is_int($_SESSION["favorite_color"]) && $_SESSION["favorite_color"] <= 4294967295){ $dynamic_style = ""; } return $dynamic_style; }