SCAN cursor [MATCH pattern] [COUNT count]

作用：迭代當前數據庫中的數據庫鍵

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; // 測試時redis中大概有20w個key，用時約2s，當count為500時用時約4s，count越大時掃描用時越短(當然需要根據你的業務需要來定)

$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 (用時2009 ms，20w中共有129798個前綴為$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：用于迭代集合鍵中的元素

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)) { // 匹配前綴為當前日期的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 (這個集合中有20w個元素)

....... 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前綴是 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 (這個集合中有10w個元素)

...... 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'的鍵

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 代碼demo (快速向有序集合添加100000個key， 其他操作類似， 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);

總結

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