PHP获取客户端真实ip的方法

function get_real_ip(){ 
	$ip=false; 
	
	if(!empty($_SERVER['HTTP_CLIENT_IP'])){ 
		$ip=$_SERVER['HTTP_CLIENT_IP']; 
	}
	
	if(!empty($_SERVER['HTTP_X_FORWARDED_FOR'])){ 
		$ips=explode (', ', $_SERVER['HTTP_X_FORWARDED_FOR']); 
		if($ip){ 
			array_unshift($ips, $ip); 
			$ip=FALSE; 
		}
		for($i=0;$i < count($ips);$i++){
			if(!eregi('^(10│172.16│192.168).',$ips[$i])){
				$ip=$ips[$i];
				break;
			}
		}
	}
	
	return ($ip ? $ip : $_SERVER['REMOTE_ADDR']); 
}

function get_real_ip(){
    static $realip;
	
    if(isset($_SERVER)){
        if(isset($_SERVER['HTTP_X_FORWARDED_FOR'])){
            $realip=$_SERVER['HTTP_X_FORWARDED_FOR'];
        }else if(isset($_SERVER['HTTP_CLIENT_IP'])){
            $realip=$_SERVER['HTTP_CLIENT_IP'];
        }else{
            $realip=$_SERVER['REMOTE_ADDR'];
        }
    }else{
        if(getenv('HTTP_X_FORWARDED_FOR')){
            $realip=getenv('HTTP_X_FORWARDED_FOR');
        }else if(getenv('HTTP_CLIENT_IP')){
            $realip=getenv('HTTP_CLIENT_IP');
        }else{
            $realip=getenv('REMOTE_ADDR');
        }
    }
	
    return $realip;
}