基于redis的自增长计数器，生成自增长数字
/**
* 生成自增长数字
*
* @param string $key 缓存key
* @param int $step 自增长步长
* @param int $expires 缓存过期时间，默认当天有效，单位秒
*
* @return int $num;
* @author leeyi <leeyisoft@qq.com>
*/
function incr_num($key = 'ddg', $step = 1, $expires = 0) {
$redis = new \Org\DDG\Redis();
$cache_key = 'incrnum:'.$key.'_setp:'.$step;
$num = $redis->handler->incrBy($cache_key, (int)$step);
if ($expires>0) {
$pexpire = 'pexpire';
$millisecond = $expires*1000;
} else {
$pexpire = 'pexpireAt';
$millisecond = get_time_235959()*1000+999;
}
if (2>$num) {
$redis->handler->$pexpire($cache_key, $millisecond); // 设置过期时间
}
return $num;
}
/**
* 根据给定时间戳，获取当天时间最后一秒的时间戳
* @author leeyi <leeyisoft@qq.com>
*/
function get_time_235959($time = '') {
$time = empty($time) ? NOW_TIME : intval($time);
return strtotime(date('Y-m-d 00:00:00', $time+86400))-1;
}
