During the development process using Laravel, we often use caching to improve system performance and reduce database pressure. Laravel provides a variety of caching methods, such as file caching, Redis caching, etc. However, when using Laravel cache, we may sometimes encounter the problem that cache::get cannot retrieve data. This article will introduce the solution to this problem encountered in Laravel development.

1. Problem description

When using Laravel's caching function, we usually use the cache::get method to obtain data from the cache. However, sometimes we find that the data we need cannot be obtained using the cache::get method. In this case, we may think of the following reasons:

1. The cache has expired or is not set, resulting in failure to obtain data.

2. There is a format or type mismatch in the data in the cache.

3. The data in the cache is modified or cleared by other programs or processes.

4. There is a problem with the code logic that causes the cache to not be set or an exception occurs during the process of obtaining data.

2. Solution

In view of the above problems, we can adopt corresponding solutions:

1. Check whether the cache has expired or is not set. You can add the expiration time parameter when setting up the cache, as shown below:

cache()->put('key',?'value',?$minutes);

Among them, $minutes is the cache time (in minutes). If the data in the cache does not exist or has expired, the cache::get method cannot obtain the data.

2. Check whether the data type or format in the cache matches. The cache driver provided by Laravel supports multiple data types, such as strings, numeric values, Boolean values, objects, etc. When storing cached data, convert it to the corresponding data type as needed. When obtaining cached data, perform corresponding type conversion according to the data type when storing, for example:

$value?=?cache::get('key');
$value?=?json_decode($value,?true);

3. Check whether the cached data has been modified or cleared by other programs or processes. In this case, we need to determine whether the cached data actually exists and the point in time when it was modified or cleared. If the cache data has been modified or cleared, we need to reset the cache or obtain the data from another trusted source.

4. Check whether the program logic is correct. Sometimes, the failure of cache::get to obtain data is caused by problems with other code. For example, when obtaining data, we may write $key incorrectly or there may be other abnormalities in the process. We need to check the relevant code to ensure the correctness of the program.

To sum up, there are many reasons why Laravel cache::get cannot obtain data, and different solutions need to be adopted according to different situations. During the development process, we should pay attention to issues such as cache expiration time, data type and data source to ensure the correctness and stability of the cache.

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