Set document root folders.

setRoot

<?php set_include_path( get_include_path() . PATH_SEPARATOR . $_SERVER['DOCUMENT_ROOT'] ); ?>

<?php /* Another way of handling the same problem */ 
 
   $path = $_SERVER['DOCUMENT_ROOT'];
   $path .= "/common/header.php";
   include_once($path);

dirname(__FILE__);

?>


<?php echo "http://" . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI']; 
function url(){
  return sprintf(
    "%s://%s%s",
    isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] != 'off' ? 'https' : 'http',
    $_SERVER['HTTP_HOST'],
    $_SERVER['REQUEST_URI']
  );
}

echo url();

?>

?>