PHP - include/require/insert some data from one file to another
<p>I'm not really familiar with php and would like to ask you to help me.</p>

<p>I want to insert <code>css</code> styling data from <code>styles.css</code> file into the <code>&lt;style&gt;</code> tag inside of <code>index.php</code>, and not sure how to do so with secure and optimized way. </p>

<p>Should I use <code>&lt;?php include 'styles.css;?&gt;</code> or <code>&lt;?php require 'styles.css;?&gt;</code> or what exactly should I do in order to insert the data in the optimized and secure way, please?</p>