PHP code optimization and performance improvement

PHP code optimization is the key to improving web development performance. This article provides seven practical techniques: 1. Caching system to reduce database overhead; 2. Use PHP built-in functions to improve efficiency; 3. Optimize database query speed; 4. Choose appropriate data structures; 5. Reduce the number of function calls; 6. Asynchronous Program to avoid blocking operations; 7. Monitor application performance to identify bottlenecks.

PHP code optimization and performance improvement

In web development, having optimized PHP code is crucial because it can improve the performance of the application and response time. This article will introduce some practical PHP code optimization techniques, with practical cases to demonstrate their effects.

Caching system

Cache can effectively reduce the overhead of database access, API calls, etc.

Practical case: Use Memcached to cache database query results.

$cache = new Memcached();
$cache->add('query_result', $result, 3600); // 缓存一小时

// 从缓存获取查询结果
$result = $cache->get('query_result');

PHP built-in functions

Using PHP built-in functions is more efficient than writing the code yourself.

Practical case: Use the substr() function to replace the string cutting operation.

// 慢
$substring = $string[0:3];

// 快
$substring = substr($string, 0, 3);

Database Optimization

Optimizing database queries can significantly improve application performance.

Practical case: Use indexes to optimize query speed.

ALTER TABLE users ADD INDEX (username);

Data structure

Choosing the appropriate data structure can improve the efficiency of the application.

Practical case: Use arrays instead of objects to store data.

// 慢
$user = new User();
$user->setName('John Doe');

// 快
$user = ['name' => 'John Doe'];

Reduce function calls

Excessive function calls will lead to performance degradation.

Practical case: Reduce the number of calls to the count() function.

// 慢
$total = count($items);

// 快
$total = sizeof($items);

Asynchronous programming

Asynchronous programming can avoid performance problems caused by blocking operations.

Practical case: Use cURL to make asynchronous HTTP requests.

$ch = curl_init();

curl_setopt_array($ch, [
    CURLOPT_URL => 'https://example.com',
    CURLOPT_TIMEOUT => 1,
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HEADER => true,
]);

$result = curl_exec($ch);

curl_close($ch);

Performance Monitoring

Monitoring the performance of your application can help identify bottlenecks and areas for improvement.

Practical case: Use Xdebug to monitor code execution time.

// 开始记录
xdebug_start_trace();

// 运行代码

// 停止记录并保存数据
$data = xdebug_get_tracefile_data();

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