<?php function doDynamicStyling() :string { $dynamic_style = ""; if(isLoggedIn() && !empty($_SESSION["favorite_color"]) && is_int($_SESSION["favorite_color"]) && $_SESSION["favorite_color"] <= 4294967295){ $dynamic_style = "<style>"; $color = dechex($_SESSION["favorite_color"]); $dynamic_style .= "--root{ --favorite-color: #$color;"; $dynamic_style .= "</style>"; } return $dynamic_style; }