redis限制单ip、单用户的访问次数

转载地址：https://blog.csdn.net/nuli888/article/details/51849465

有时候我们需要限制一个api或页面访问的频率，例如单ip或单用户一分钟之内只能访问多少次 
类似于这样的需求很容易用Redis来实现

<?php  
$redis = new Redis();  
$redis->connect('127.0.0.1', 6379); 
$redis->auth("php001");
//这个key记录该ip的访问次数 也可改成用户id 
//$key = 'userid_11100';
$key=get_real_ip();
 
//限制次数为5
$limit = 5;
 
$check = $redis->exists($key);
if($check){
	$redis->incr($key);
	$count = $redis->get($key);
	if($count > 5){
		exit('请求太频繁，请稍后再试！');
	}
}else{
	$redis->incr($key);
	//限制时间为60秒 
	$redis->expire($key,60);
}
 
$count = $redis->get($key);
echo '第 '.$count.' 次请求';
 
//获取客户端真实ip地址
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;
}
?>