title: Multiple folders linking to css files PHP
body: <p>I have a PHP file called <code>header.php</code> which contains as follows: </p>
  
  <pre><code>&lt;title&gt;&lt;?php echo $title; ?&gt;&lt;/title&gt;
  &lt;link href="core/css/styles.css" rel="stylesheet" /&gt; 
  &lt;link href="core/css/bootstrap.css" rel="stylesheet"&gt;
  </code></pre>
  
  <p>When on the root folder of my website it is easy to access these files. Simply using: <code>include 'header.php'</code>. However when I am in a directory other than root, for example <code>order/</code> the files are not able to be accessed. I can access the PHP file by going back a directory using: <code>include '../header.php'</code> however this does not work for the css files included in that file and they cannot be accessed by the file that is not in the root directory.</p>
  
  <p>Can anyone help me with a way to come over this? I like only having one <code>header.php</code> file as I can then add/remove files from that document and the change will appear across the whole site.</p>
  
  <p>Many thanks,
  Harry</p>