PHP redis SCAN、SSCAN、ZSCAN、HSCAN 的使用， pipe 快速redis插入数据

自己写的代码，删除1千万线上redis数据 
        $iterator = null;
        $count = 1000;
        $prefix = 'log:';
        $this->redis->setOption(Redis::OPT_SCAN, Redis::SCAN_RETRY);
        while($keys = $this->redis->scan($iterator,$prefix."*",$count)) {
            foreach($keys as $key) {
                if(strpos($key,'log') !== false){
                   $this->redis->del($key);
                    echo $key.PHP_EOL;
                }
            }
        }

SCAN

• SCAN cursor [MATCH pattern] [COUNT count]
• 作用：迭代当前数据库中的数据库键
• SCAN 使用 demo

  connect('127.0.0.1', 6379);
  /* Options for the SCAN family of commands, indicating whether to abstract
     empty results from the user.  If set to SCAN_NORETRY (the default), phpredis
     will just issue one SCAN command at a time, sometimes returning an empty
     array of results.  If set to SCAN_RETRY, phpredis will retry the scan command
     until keys come back OR Redis returns an iterator of zero */
  $redis->setOption(Redis::OPT_SCAN, Redis::SCAN_RETRY);
  $iterator = null;
  $count = 1000; // 测试时redis中大概有20w个key，用时约2s，当count为500时用时约4s，count越大时扫描用时越短（当然需要根据你的业务需要来定）
  $prefix = date('Ymd');
  $time1 = msectime();
  $total = [];
  while ($arrKeys = $redis->scan($iterator, $prefix . '*', $count)) {
      $arrValues = $redis->mget($arrKeys);
      $ret = array_combine($arrKeys, $arrValues);
      $total = array_merge($total, $ret);
  }
  $time2 = msectime();
  $time = $time2 - $time1;
  echo 'time : ' . $time  . ' ms; total keys : ' . count($total) . PHP_EOL;
  // time : 2009 ms; total keys : 129798  （用时2009 ms，20w中共有129798个前缀为$prefix的key）
  function msectime() {
      list($msec, $sec) = explode(' ', microtime());
      $msectime = (float)sprintf('%.0f', (floatval($msec) + floatval($sec)) * 1000);
      return $msectime;
  }

  SSCAN

• SCAN cursor [MATCH pattern] [COUNT count]
• 作用：用于迭代集合键中的元素
• SSCAN使用demo

  connect('127.0.0.1', 6379);
  $redis->setOption(Redis::OPT_SCAN, Redis::SCAN_RETRY);
  $time1 = msectime();
  while ($arrKeys = $redis->sscan($mainKey, $iterator, $prefix . '*', $count)) { // 匹配前缀为当前日期的key
      $total += $arrKeys;
  }
  $time2 = msectime();
  $time = $time2 - $time1;
  echo 'use time : ' . $time  . ' ms; total keys : ' . count($total) . PHP_EOL;
  // use time : 649 ms; total keys : 90010 （这个集合中有20w个元素）
  ....... other code ......

  ZSCAN

• ZSCAN cursor [MATCH pattern] [COUNT count]
• 作用：用于迭代有序集合中的元素
• ZSCAN使用demo

  connect('127.0.0.1', 6379);
  $redis->setOption(Redis::OPT_SCAN, Redis::SCAN_RETRY);
  $time1 = msectime();
  while ($arrKeys = $redis->zscan($mainKey, $iterator, $prefix . '*', $count)) { // 匹配key前缀是 10 的所有key
      var_dump($arrKeys);
      $total += $arrKeys;
  }
  $time2 = msectime();
  $time = $time2 - $time1;
  echo 'use time : ' . $time  . ' ms; total keys : ' . count($total) . PHP_EOL;
  // use time : 317 ms; total keys : 1111 （这个集合中有10w个元素）
  ...... other code ......

  HSCAN

• HSCAN cursor [MATCH pattern] [COUNT count]
• 作用：用于迭代哈希中的元素
• HSACN 使用demo

  connect('127.0.0.1', 6379);
  $redis->setOption(Redis::OPT_SCAN, Redis::SCAN_RETRY);
  $time1 = msectime();
  while ($arrKeys = $redis->hscan($mainKey, $iterator, $match, $count)) { // 匹配含有'key'的键
      var_dump($arrKeys);
      $total += $arrKeys;
  }
  $time2 = msectime();
  $time = $time2 - $time1;
  echo 'use time : ' . $time  . ' ms; total keys : ' . count($total) . PHP_EOL;
  // use time : 1484 ms; total keys : 100000
  ...... other code ......

  redis pipe 代码demo (快速向有序集合添加100000个key， 其他操作类似， 只要修改for中的操作即可)

• $pipe = $redis->multi(Redis::PIPELINE);
  for ($i = 0; $i < 100000; $i++) {
      $redis->zAdd($key, $i, $i);
  }
  $curValues = $pipe->exec();
  $val = $redis->zRange($key, 0, -1, true);
  var_dump($val);