Fatal error: wp-includes/vars.php on line 16 – please help me to fix this issue

Hi Any one help me to fix this issue
I am getting the this Error
Fatal error: Call to undefined function is_admin() in /hermes/web02/b2262/user/wp-includes/vars.php on line 16

I attached the var.php file too

Thanks
Shawn

<?php
/**
* Creates common globals for the rest of WordPress
*
* Sets $pagenow global which is the current page. Checks
* for the browser to set which one is currently being used.
*
* Detects which user environment WordPress is being used on.
* Only attempts to check for Apache and IIS. Two web servers
* with known permalink capability.
*
* @package WordPress
*/

// On which page are we ?
if ( is_admin() ) {
// wp-admin pages are checked more carefully
preg_match(‘#/wp-admin/?(.*?)$#i’, $PHP_SELF, $self_matches);
$pagenow = $self_matches[1];
$pagenow = trim($pagenow, ‘/’);
$pagenow = preg_replace(‘#\?.*?$#’, ”, $pagenow);
if ( ” === $pagenow || ‘index’ === $pagenow || ‘index.php’ === $pagenow ) {
$pagenow = ‘index.php’;
} else {
preg_match(‘#(.*?)(/|$)#’, $pagenow, $self_matches);
$pagenow = strtolower($self_matches[1]);
if ( ‘.php’ !== substr($pagenow, -4, 4) )
$pagenow .= ‘.php’; // for Options +Multiviews: /wp-admin/themes/index.php (themes.php is queried)
}
} else {
if ( preg_match(‘#([^/]+\.php)([?/].*?)?$#i’, $PHP_SELF, $self_matches) )
$pagenow = strtolower($self_matches[1]);
else
$pagenow = ‘index.php’;
}

// Simple browser detection
$is_lynx = $is_gecko = $is_winIE = $is_macIE = $is_opera = $is_NS4 = $is_safari = $is_chrome = $is_iphone = false;

if ( isset($_SERVER[‘HTTP_USER_AGENT’]) ) {
if ( strpos($_SERVER[‘HTTP_USER_AGENT’], ‘Lynx’) !== false ) {
$is_lynx = true;
} elseif ( strpos(strtolower($_SERVER[‘HTTP_USER_AGENT’]), ‘chrome’) !== false ) {
$is_chrome = true;
} elseif ( strpos(strtolower($_SERVER[‘HTTP_USER_AGENT’]), ‘safari’) !== false ) {
$is_safari = true;
} elseif ( strpos($_SERVER[‘HTTP_USER_AGENT’], ‘Gecko’) !== false ) {
$is_gecko = true;
} elseif ( strpos($_SERVER[‘HTTP_USER_AGENT’], ‘MSIE’) !== false && strpos($_SERVER[‘HTTP_USER_AGENT’], ‘Win’) !== false ) {
$is_winIE = true;
} elseif ( strpos($_SERVER[‘HTTP_USER_AGENT’], ‘MSIE’) !== false && strpos($_SERVER[‘HTTP_USER_AGENT’], ‘Mac’) !== false ) {
$is_macIE = true;
} elseif ( strpos($_SERVER[‘HTTP_USER_AGENT’], ‘Opera’) !== false ) {
$is_opera = true;
} elseif ( strpos($_SERVER[‘HTTP_USER_AGENT’], ‘Nav’) !== false && strpos($_SERVER[‘HTTP_USER_AGENT’], ‘Mozilla/4.’) !== false ) {
$is_NS4 = true;
}
}

if ( $is_safari && strpos(strtolower($_SERVER[‘HTTP_USER_AGENT’]), ‘mobile’) !== false )
$is_iphone = true;

$is_IE = ( $is_macIE || $is_winIE );

// Server detection

/**
* Whether the server software is Apache or something else
* @global bool $is_apache
*/
$is_apache = (strpos($_SERVER[‘SERVER_SOFTWARE’], ‘Apache’) !== false || strpos($_SERVER[‘SERVER_SOFTWARE’], ‘LiteSpeed’) !== false);

/**
* Whether the server software is IIS or something else
* @global bool $is_IIS
*/
$is_IIS = (strpos($_SERVER[‘SERVER_SOFTWARE’], ‘Microsoft-IIS’) !== false || strpos($_SERVER[‘SERVER_SOFTWARE’], ‘ExpressionDevServer’) !== false);

/**
* Whether the server software is IIS 7.X
* @global bool $is_iis7
*/
$is_iis7 = (strpos($_SERVER[‘SERVER_SOFTWARE’], ‘Microsoft-IIS/7.’) !== false);

?>