BitMap算法
<?php
$redisHost = '127.0.0.1';
$redisPassWord = '';
$redisPort = 6379;
$redis = new \Redis();
$redis->connect($redisHost, $redisPort);
$redis->setOption(\Redis::OPT_READ_TIMEOUT, -1);
$redisPassWord && $redis->auth($redisPassWord);
$cacheKey = 'asdhasdhsjahdjahdjkahs';
$maxOffSet = 4294967296;
$redis->setBit($cacheKey, 7, 0);
// 高危。。。 如果值很小调用get 没有问题，如果值很大，则会出现没有反应的情况
$result = $redis->get($cacheKey);
$result = $redis->getbit($cacheKey, 13000);
$start = microtime(true);
sleep(1);
echo (microtime(true) - $start) . PHP_EOL;
$start = microtime(true);
$result = $redis->bitCount($cacheKey);
echo (microtime(true) - $start) . PHP_EOL;