PHP 7 performance optimization tips: How to use APC cache to speed up script execution

PHP 7 performance optimization tips: How to use APC cache to accelerate script execution

Introduction:
With the increasing complexity of network applications and the increasing number of users, optimizing the performance of PHP scripts has become particularly important. . One common optimization method is to use caching to reduce script execution time. In PHP, APC (Alternative PHP Cache) is a widely used caching tool that can significantly improve the performance of scripts. This article will introduce how to use APC caching to speed up the execution of PHP 7 scripts, and attach corresponding code examples.

Step One: Install and Configure APC Cache
First, make sure your PHP version is 7 or higher and have the APC extension installed. In most cases, the APC extension is enabled by default during PHP's compilation process. If you are not sure whether the APC extension is installed, you can look for the apc.enabled parameter in the PHP configuration file php.ini.

If the value of the apc.enabled parameter is Off or there is no such parameter, you need to perform the following operations to install, enable and configure the APC cache:

1. Run the following command in the terminal to Install the APC extension:
   sudo apt-get install php-apcu

2. Open the PHP configuration file php.ini and add the following configuration parameters:

   extension=apcu.so
   apc.enabled=1
   apc.enable_cli=1

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3. Save and close the php.ini file, and restart your web server.

Step 2: Use APC cache to speed up script execution
Once APC cache is installed and configured, you can use the following two methods to speed up script execution:

Method 1: Use cache functions
APC extension provides several functions to help you use cache. The most commonly used are the apcu_fetch and apcu_store functions.

The following is a simple example showing how to use the apcu_fetch and apcu_store functions to cache database query results:

function get_users() {
    $key = 'users';
    $users = apcu_fetch($key);
    
    if ($users === false) {
        // 如果缓存未命中，执行数据库查询
        $users = // 执行数据库查询的代码...
        
        // 将查询结果存储到缓存中
        apcu_store($key, $users, 3600); // 缓存有效时间为1小时
    }
    
    return $users;
}

In the above example, we first use the apcu_fetch function to try to retrieve the results from the cache Get user data. If there is no corresponding data in the cache, we execute the database query and store the query results into the cache using the apcu_store function. In this way, the next time we call the get_users function, we can get the data directly from the cache without executing the database query again, thus improving the execution speed of the script.

Method 2: Use cache classes
In addition to using cache functions, APC cache can also speed up script execution by using cache classes. The following is an example that shows how to use the APC cache class to cache calculation results:

// 引入APC缓存类
use SymfonyCompononentCacheAdapterApcuAdapter;

// 创建缓存实例
$cache = new ApcuAdapter();

// 通过缓存实例获取结果
$result = $cache->get('result', function () {
    // 如果缓存未命中，执行计算并返回结果
    $result = // 执行计算的代码...
    
    return $result;
});

In the above example, we use the ApcuAdapter class to create a cache instance and obtain the results through the specified key name. If the cache misses, we perform the calculation via an anonymous function and return the result. At the same time, the calculation results will also be cached so that they can be obtained directly from the cache next time.

Conclusion:
Using APC cache to accelerate the execution of PHP 7 scripts is a simple and effective performance optimization method. By properly using cache functions and cache classes, we can significantly reduce script execution time, thereby improving application performance and response speed. I hope this article will help you optimize the performance of your PHP scripts.

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