用cookie对用户在某个时间范围内的提交次数进行计数

<?php
/**
 * @author flynetcn
 */
class utils_spam
{
    /**
     * 用cookie对用户在某个时间范围内的提交次数进行计数
     * @param str $counterKey cookie键
     * @param int $intervalSec 多少秒内
     * @return int 本次累计后的计数
     */
    public static function submitCounter($counterKey, $intervalSec=300)
    {
        if (!isset($_COOKIE[$counterKey])) {
            $_COOKIE[$counterKey] = array('c'=>1, 't'=>time());
        } else {
            if (!is_array($_COOKIE[$counterKey])) {
                $_COOKIE[$counterKey] = unserialize(base64_decode($_COOKIE[$counterKey]));
            }
            if (time() - $_COOKIE[$counterKey]['t'] > $intervalSec) {
                $_COOKIE[$counterKey] = array('c'=>1, 't'=>time());
            } else {
                $_COOKIE[$counterKey]['c']++;
            }
        }
        setcookie($counterKey, base64_encode(serialize($_COOKIE[$counterKey])), time()+$intervalSec);
        return $_COOKIE[$counterKey]['c'];
    }

    /**
     * 获取当前计数值
     * @param str $counterKey cookie键
     * @return int 当前计数
     */
    public static function getSubmitCounter($counterKey)
    {
        if (!isset($_COOKIE[$counterKey])) {
            return 0;
        } else {
            if (!is_array($_COOKIE[$counterKey])) {
                $_COOKIE[$counterKey] = unserialize(base64_decode($_COOKIE[$counterKey]));
            }
            return $_COOKIE[$counterKey]['c'];
        }
    }
}