How to link a stylesheet to a website via php

Question

css path :- resolution/css
inc path :- resolution/inc/header.php
page path :- resolution/pages/itmMgr.php
index path :- resolution/index.html

<?php request_once="header.php">

Answer 1

Try,
<?php include 'header.php'; ?>
<style>
<?php include 'css/main.css'; ?>
</style>