What are the common ways to lock redis?

Commonly used locking methods are:

(Learning video sharing: redis video tutorial)

1. Add incr Lock

<?php
$redis  =  new Redis();
$redis->connect(&#39;127.0.0.1&#39;);
$redis->multi();
$redis->incr(&#39;number&#39;);
//$redis->decr(&#39;number&#39;);
//$redis->expire(&#39;number&#39;, -1);
var_dump($redis->get(&#39;number&#39;));
var_dump($redis->ttl(&#39;number&#39;));

2. Setnx lock

<?php
$redis->setnx(&#39;name&#39;, &#39;felix&#39;);
var_dump($redis->get(&#39;name&#39;));
var_dump($redis->ttl(&#39;name&#39;));

3. Set lock

<?php
$redis->set(&#39;like&#39;, &#39;chuangxi&#39;, [&#39;nx&#39;, &#39;ex&#39; => 10]);
//$redis->del(&#39;like&#39;);
var_dump($redis->get(&#39;like&#39;));
var_dump($redis->ttl(&#39;like&#39;));

4. Prevent deadlock

<?php
$isLock = false;
do {
    $isLock = $redis->set(&#39;like&#39;, &#39;a&#39;, [&#39;nx&#39;, &#39;ex&#39; => 10]);
    if($isLock) {
        if($redis->get(&#39;like&#39;) == &#39;a&#39;) {
            //执行逻辑
            $redis->del(&#39;like&#39;);
            continue;
        }
    } else {
        usleep(5000);
    }
} while (!$isLock);
 
//redis事务
$redis->set();
$redis->watch([&#39;number&#39;, &#39;like&#39;]);

Related recommendations: redis tutorial

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