//获取IP	public static function getIp() {		if (getenv ( 'HTTP_CLIENT_IP' ) && strcasecmp ( getenv ( 'HTTP_CLIENT_IP' ), 'unknown' )) {			$ip = getenv ( 'HTTP_CLIENT_IP' );		} elseif (getenv ( 'HTTP_X_FORWARDED_FOR' ) && strcasecmp ( getenv ( 'HTTP_X_FORWARDED_FOR' ), 'unknown' )) {			$ip = getenv ( 'HTTP_X_FORWARDED_FOR' );		} elseif (getenv ( 'REMOTE_ADDR' ) && strcasecmp ( getenv ( 'REMOTE_ADDR' ), 'unknown' )) {			$ip = getenv ( 'REMOTE_ADDR' );		} elseif (isset ( $_SERVER ['REMOTE_ADDR'] ) && $_SERVER ['REMOTE_ADDR'] && strcasecmp ( $_SERVER ['REMOTE_ADDR'], 'unknown' )) {			$ip = $_SERVER ['REMOTE_ADDR'];		}		return preg_match ( "/[\d\.]{7,15}/", $ip, $matches ) ? $matches [0] : 'unknown';	}