Add Browser to the WordPress Body Class

This function checks for/detects the listed browsers, and outputs the browser name as a body class in WordPress.

/*-----------------------------------------------------------------------------------*/
/* Browser detection body_class() output */
/*-----------------------------------------------------------------------------------*/
add_filter( 'body_class','browser_body_class' );
function browser_body_class($classes) {
	global $is_lynx, $is_gecko, $is_IE, $is_opera,
 $is_NS4, $is_safari, $is_chrome, $is_iphone;

	if($is_lynx) $classes[] = 'lynx';//don't need
	elseif($is_gecko) $classes[] = 'gecko';
	elseif($is_opera) $classes[] = 'opera';
	elseif($is_NS4) $classes[] = 'ns4';
	elseif($is_safari) $classes[] = 'safari';
	elseif($is_chrome) $classes[] = 'chrome';//don't need
	elseif($is_IE) {
		$browser = $_SERVER['HTTP_USER_AGENT'];
		$browser = substr( "$browser", 25, 8);
		if ($browser == "MSIE 7.0"  ) {
			$classes[] = 'ie7';
			$classes[] = 'ie';
		} elseif ($browser == "MSIE 6.0" ) {
			$classes[] = 'ie6';
			$classes[] = 'ie';
		} elseif ($browser == "MSIE 8.0" ) {
			$classes[] = 'ie8';
			$classes[] = 'ie';
		} elseif ($browser == "MSIE 9.0" ) {
			$classes[] = 'ie9';
			$classes[] = 'ie';
		} else {
			$classes[] = 'ie';
		}
	}
	else $classes[] = 'unknown';

	if($is_iphone) $classes[] = 'iPhone';
	return $classes;
}