title: How can I define the DIRECTORY_SEPARATOR for both Windows and Linux platforms?
body: <p>Now I create a small PHP Application, here I have problem for using file path, because in Windows use this type location <code>C:\Some\Location\index</code> but in <code>Linux /www/app/index</code> so when I define the path using this <code>/</code> but when the application run in window machine it should be problem for this <code>/</code>.   </p>
  
  <p>So here I want to define the DIRECTORY_SEPARATOR both Windows and Linux platform.</p>