function getBaseUrl() {
// output: /myproject/index.php
$currentPath = $_SERVER['PHP_SELF'];

// output: Array ( [dirname] => /myproject [basename] => index.php [extension] => php [filename] => index )
$pathInfo = pathinfo($currentPath);

// output: localhost
$hostName = $_SERVER['HTTP_HOST'];

// output: http://
$protocol = strtolower(substr($_SERVER["SERVER_PROTOCOL"],0,5))=='https://'?'https://':'http://';

// return: http://localhost/myproject/
return $protocol.$hostName.$pathInfo['dirname']."/";
}

$base = getBaseUrl();
require_once $base.'_include/db/qry.php';
require_once $base.'_include/db/functions.php';

Warning: require_once(): http:// wrapper is disabled in the server configuration by allow_url_include=0 in C:xampphtdocsmysite_includeheader.php on line 9

Warning: require_once(http://localhost/mysite/_include/db/qry.php): failed to open stream: no suitable wrapper could be found in C:xampphtdocsmysite_includeheader.php on line 9

Fatal error: require_once(): Failed opening required 'http://localhost/mysite/_include/db/qry.php' (include_path='.;C:xamppphpPEAR') in C:xampphtdocsmysite_includeheader.php on line 9

// just example, change to fit your real path.
$base = __DIR__ . '/../';

require_once $base.'_include/db/qry.php';
require_once $base.'_include/db/functions.php';