<style>
 <?php echo require_once("css/style.css"); ?>
</style>


<script>
 <?php echo require_once("js/myjs.js"); ?>
</script>

echo '<style type="text/css">'.file_get_contents('/path-to-your/style.css').'</style>';

if(isset($_COOKIE['v'])) $CZ='<link href="default.css" rel="stylesheet">';
else {
$CZ='<style>'.file_get_contents('default.css').'</style><link rel="prefetch" href="default.css">';setcookie('v','1',time()+31556926,'/','example.com',1,1);
}