Redis 中如何使用 scan 替换 keys

<?php
// 生成1000个
$redis = new \Redis();
$redis->connect(&#39;127.0.0.1&#39;, 6379, 10);
$redis->select(2);
$arr = [
    &#39;rwer&#39;,
    &#39;24erw&#39;,
    &#39;rterq4&#39;,
    &#39;sdgfd5&#39;,
    &#39;dgsdg&#39;,
    &#39;sfst&#39;,
];
for ($i=0; $i<1000; $i++) {
    $redis->set(md5($i.$arr[$i%6]), md5($arr[$i%6].&#39;sdfsd&#39;));
}
echo "OK".PHP_EOL;

<?php
$redis = new \Redis();
$redis->connect(&#39;127.0.0.1&#39;, 6379, 10);
$redis->select(2);
$iterator = null;
// 遍历前缀
$pattern = &#39;c*&#39;;
$count = 100;
// 务必设置，如果没扫描到，继续扫描，而不是返回空，否则while直接退出，遍历就会不准确
$redis->setOption(\Redis::OPT_SCAN, \Redis::SCAN_RETRY);
$total = [];
$i = 0;
// $count可以不设置，非必需参数
while($arr = $redis->scan($iterator, $pattern, $count)) {
    $arrVal = $redis->mget($arr);
    $ret = array_combine($arr, $arrVal);
    $total = array_merge($total, $ret);
    $i++;
}
// var_dump($total);
var_dump($i);
echo count($total).PHP_EOL;