Yii2-Redis use note

Yii2-Redis used note a few days ago a simple learning Redis, now ready to use it on the project. We are currently using the Yii2 framework, in the official website to search for Redis, we found the yii2-redis this extension.

After installation, it is very easy to use. open the common/config/main. php file and modify it as follows.

Text

'cache' => [    // 'class' => 'yii\caching\FileCache',    'class' => 'yii\redis\Cache',],'redis' => [    'class' => 'yii\redis\Connection',    'hostname' => 'localhost',    'port' => 6379,    'database' => 0,],

'cache' => [    // 'class' => 'yii\caching\FileCache',    'class' => 'yii\redis\Cache',],'redis' => [    'class' => 'yii\redis\Connection',    'hostname' => 'localhost',    'port' => 6379,    'database' => 0,],

Okay, now we have used redis to take over the yii cache. the cache usage is the same as before. how can we use it now? but there is a bug that does not count as a bug, so it's a pitfall, will be said later.

To test the cache first,

Text

Yii::$app->cache->set('test', 'hehe..');echo Yii::$app->cache->get('test'), "\n";Yii::$app->cache->set('test1', 'haha..', 5);echo '1 ', Yii::$app->cache->get('test1'), "\n";sleep(6);echo '2 ', Yii::$app->cache->get('test1'), "\n";

Yii::$app->cache->set('test', 'hehe..');echo Yii::$app->cache->get('test'), "\n";Yii::$app->cache->set('test1', 'haha..', 5);echo '1 ', Yii::$app->cache->get('test1'), "\n";sleep(6);echo '2 ', Yii::$app->cache->get('test1'), "\n";

Let's take a look at the test results.

It is the same as the original usage ..

But as I said, there is a bug that does not count as a bug. So what is it?

If you directly use redis to take over the cache, if it is normal to use, but when the expiration time value exceeds the int range, redis will report an error.

I used the yii2-admin, coincidentally let me step on the pit, because he cached 30 days, that is, 2592000 seconds, and redis Cache time precision default uses milliseconds, so the time is 2592000000 milliseconds.

The expiration time of redis can only be int type. php in Cache. php is forcibly converted to int type without any other processing, so it will become-1702967296 and an error will be reported.

But directly under the redis command line will not be negative ,.

But it doesn't matter. it's easy to fix. we can change it to seconds.

Open vendor/yiisoft/yii2-redis/Cache. php

The

133

Line, modify to the following code.

Text

Protected function setValue ($ key, $ value, $ expire) {if ($ expire = 0) {return (bool) $ this-> redis-> executeCommand ('set ', [$ key, $ value]);} else {// $ expire = (int) ($ expire * 1000); // Default unit: millisecond // return (bool) $ this-> redis-> executeCommand ('set', [$ key, $ value, 'px ', $ expire]); $ expire = + $ expire> 0? $ Expire: 0; // prevent negative return (bool) $ this-> redis-> executeCommand ('set', [$ key, $ value, 'Ex ', $ expire]); // cache by second }}

Protected function setValue ($ key, $ value, $ expire) {if ($ expire = 0) {return (bool) $ this-> redis-> executeCommand ('set ', [$ key, $ value]);} else {// $ expire = (int) ($ expire * 1000); // Default unit: millisecond // return (bool) $ this-> redis-> executeCommand ('set', [$ key, $ value, 'px ', $ expire]); $ expire = + $ expire> 0? $ Expire: 0; // prevent negative return (bool) $ this-> redis-> executeCommand ('set', [$ key, $ value, 'Ex ', $ expire]); // cache by second }}

In this case, OK.

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