Detailed explanation of PHP laravel cache mechanism

This article brings you relevant knowledge about laravel, which mainly introduces the cache in Laravel that provides us with three caching mechanisms: Redis, memcache, and the file cache of the framework Let’s take a look at the relevant content below. I hope it will be helpful to everyone.

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The cache in Laravel provides us with three caching mechanisms.

Redis, memcache, and the framework’s file cache.

The main thing to look at here is the file cache in the cache.

1. Access multiple cache stores

Using the Cache facade, you can use the store method to access different cache stores, passing in ## The key of the #store method is the corresponding storage listed in the stores configuration array in the cache configuration file:

$value = Cache::store('file')->get('foo');
Cache::store('redis')->put('bar', 'baz', 600);  // 10分钟

2. Get data from the cache

1. Get the data and set the default value

(1): Normal value

$value = Cache::get('key');

(2): If it does not exist , with default value

$value = Cache::get('key', 'default');

(3): Use closure operation, with default value

$value = Cache::get('key', function() {
    return DB::table(...)->get();
});

2. Check whether the cache item exists

has method is used to determine whether the cache item exists. If the value is null or false, the method will return false:

if (Cache::has('key')) {
    //
}

3. Value increase/decrease

increment and decrement methods can be used to adjust The integer value in the cache. Both methods can receive a second parameter to specify the number of increments and decrements in the cache item value:

Cache::increment('key');
Cache::increment('key', $amount);
Cache::decrement('key');
Cache::decrement('key', $amount);

4. Get & Store

Sometimes you may want to get the cache item, But if the requested cache item does not exist, store a default value for it. For example, you might want to get all users from the cache, or if they don't exist, get them from the database and add them to the cache. You can do this by using the Cache::remember method:

$value = Cache::remember('users', $seconds, function() {
    return DB::table('users')->get();
});

If the cache item does not exist, the closure passed to the remember method is executed and the result is stored in the cache.

You can also use the rememberForever method to get data from the cache or store it permanently:

$value = Cache::rememberForever('users', function() {
    return DB::table('users')->get();
});

5. Get & Delete

If you need to get the data from the cache The item is then deleted. You can use the pull method, which is the same as the get method. If the cache item does not exist, null is returned:

$value = Cache::pull('key');

3. Store data in the cache

1. Get the stored data

You can use the put method on the Cache facade to store data in the cache. When you store data in the cache, you need to specify the time (number of seconds) for the data to be cached:

Cache::put('key', 'value', $seconds);

If the cache time is not passed to the put method, the cache item is permanently valid:

Cache::put('key', 'value');

In addition to passing the cache item expiration time, you can also pass a PHP Datetime instance that represents the cache item's validity time:

$expiresAt = Carbon::now()->addMinutes(10);
Cache::put('key', 'value', $expiresAt);

2. Store data when the cache does not exist

add method will only be in the cache Add data to the cache if the item does not exist. If the data is successfully added to the cache, return true, otherwise, return false:

Cache::add('key', 'value', $seconds);

3. Permanently store data

forever method is used for persistence To store data in the cache, these values ​​must be manually removed from the cache through the forget method:

Cache::forever('key', 'value');

4. Remove data from the cache

You can use the forget method on the Cache facade to remove it from the cache Remove cache item data:

Cache::forget('key');

You can also remove cache items by setting the cache validity period to 0 or a negative number:

Cache::put('key', 'value', 0);
 
Cache::put('key', 'value', -5);

If you want to clear all caches, you can pass

flushMethod:

Cache::flush();

The above is basically how the laravel framework operates on file caching

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laravel video tutorial]

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