How to use file caching technology in PHP to achieve data classification storage?

With the continuous development of Internet technology, data processing has become an indispensable part of modern society. In websites and applications, it is necessary to store and manipulate large amounts of data. One of the common data processing technologies is caching.

Cache stores frequently used data in memory to facilitate quick access and processing of data. In PHP, it is usually implemented using file caching technology (File Cache). The basic principle of file caching technology is to read data from a database or other time-consuming storage sources, convert the data into text format and store it on the local disk of the server. When users need to access this data, they can accelerate the acquisition of this data by reading the text stored on the local disk. And if the data has been cached, the time and frequency of reading this data can be greatly reduced, thereby improving application performance.

How to implement data classification storage when using file caching technology? The following are some suggestions:

1. Determine the classification basis of cached data

When implementing file caching technology to store data, you first need to determine the classification basis of cached data. The basis for classifying data should match the characteristics of the application. For example, in an e-commerce application, you can sort by item ID or category. In a blogging application, you can sort by author name or post title. Through classification, the query efficiency of cached data can be greatly improved.

2. Create cache folder

Create an appropriate cache folder on the local disk based on the classification basis. For example, in an e-commerce application, cache folders can be created separately by product ID or category, while in a blogging application, cache folders can be created separately by author name or post title.

3. Writing a cache class

In file caching technology, writing a cache class is necessary. This class can contain the following methods:

• getCache(): Get data from the cache file based on the cache ID.
• setCache(): Store data in the specified cache ID and file name.
• deleteCache(): Delete the data in the specified cache ID and file name.

For example, in an e-commerce application, you can define the cache class as follows:

class FileCache {

    protected $cacheFolder = 'cache/';

    public function __construct() {
        if (!file_exists($this->cacheFolder)) {
            mkdir($this->cacheFolder);
        }
    }

    public function getCache($categoryId, $productId) {
        $cacheId = $categoryId . '_' . $productId;
        $cacheFile = $this->cacheFolder . $categoryId . '/' . $cacheId . '.txt';
        if (!file_exists($cacheFile)) {
            return false;
        }
        $data = file_get_contents($cacheFile);
        return unserialize($data);
    }

    public function setCache($categoryId, $productId, $data) {
        $cacheId = $categoryId . '_' . $productId;
        $cacheFolder = $this->cacheFolder . $categoryId . '/';
        if (!file_exists($cacheFolder)) {
            mkdir($cacheFolder);
        }
        $cacheFile = $cacheFolder . $cacheId . '.txt';
        $data = serialize($data);
        file_put_contents($cacheFile, $data);
    }

    public function deleteCache($categoryId, $productId) {
        $cacheId = $categoryId . '_' . $productId;
        $cacheFile = $this->cacheFolder . $categoryId . '/' . $cacheId . '.txt';
        if (file_exists($cacheFile)) {
            unlink($cacheFile);
        }
    }
}

The above is an example in an e-commerce application, which includes classification according to the category to which the product belongs. code.

4. Implementing cached data

In an application, when any classified data needs to be accessed, the cache should be checked to determine whether the data has been cached. If the cache has not been established, the data is fetched from the source and stored in the cache. If the cache has been established, the data is read directly from the cache.

For example, the following code snippet shows how to implement caching data in the cache class:

$category = $_GET['category'];
$product_id = $_GET['product_id'];

$fileCache = new FileCache();

$cacheData = $fileCache->getCache($category, $product_id);

if (!$cacheData) {
    $sourceData = // get data from source
    $fileCache->setCache($category, $product_id, $sourceData);
} else {
    // use data from cache
    $data = $cacheData;
}

In the above example, the categorical data is first fetched from the cache. If the data cannot be read from the cache, it is obtained from the source and stored in a new cache file.

Through the above methods, data can be stored according to different classifications, thereby greatly improving the efficiency of caching and querying data. At the same time, this approach is more maintainable because you can easily locate the data and cache and query it as separate functions.

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