redis实际项目作用

<?php
/**
 * 获取ip
 * @return array|false|string
 */
function getIp()
{
    if (getenv("HTTP_CLIENT_IP") && strcasecmp(getenv("HTTP_CLIENT_IP"), "unknown"))
        $ip = getenv("HTTP_CLIENT_IP");
    else if (getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR"), "unknown"))
        $ip = getenv("HTTP_X_FORWARDED_FOR");
    else if (getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR"), "unknown"))
        $ip = getenv("REMOTE_ADDR");
    else if (isset($_SERVER[‘REMOTE_ADDR‘]) && $_SERVER[‘REMOTE_ADDR‘] && strcasecmp($_SERVER[‘REMOTE_ADDR‘], "unknown"))
        $ip = $_SERVER[‘REMOTE_ADDR‘];
    else
        $ip = "unknown";

    return ($ip);
}

$ip = getIp();

$redis = new Redis();
$redis->connect(‘127.0.0.1‘,‘6379‘);
$key = "api-".$ip."-limit";
$num = 5;

if ($redis->exists($key)) {
    $redis->incr($key);
    $result = $redis->get($key);

    if ($result > 5) {
        exit(‘次数过多‘);
    }

}else{
    $redis->incr($key);
    $redis->expire($key,60);
}

print_r(‘这是获得第 ‘.$redis->get($key)." 次");