The combination of PHP writing specifications and performance optimization: the key to improving website speed

The combination of PHP writing specifications and performance optimization: the key to improving website speed

Introduction:
With the rapid development of the Internet, the speed of the website has an important impact on user experience And search engine optimization plays a vital role. PHP is a widely used programming language. The combination of writing specifications and performance optimization can significantly improve the speed and performance of the website. This article introduces some common writing conventions and performance optimization techniques, and provides code examples to demonstrate their effect.

1. Writing specifications

1. Optimizing code structure
   A good code structure can make the code more readable, easy to maintain and easy to optimize performance. The following are some suggestions for writing specifications:
   (1) Use appropriate naming methods to clarify the purpose and function of variables, functions and classes.
   (2) Avoid too long lines of code. Usually each line of code should be controlled within 80 characters.
   (3) Use appropriate indentation and spaces to make the code more readable.
   (4) Reasonable use of comments to explain key codes and algorithms.
2. Using PHP built-in functions
   PHP provides many built-in functions that are optimized and tested to quickly perform common operations. The following are some commonly used built-in functions:
   (1) str_replace() replaces the regular expression replacement function and can quickly replace text in a string.
   (2) array_map() is a function used to process arrays, which can make the code more concise and efficient.
   (3) isset() and empty() are used to detect whether the variable is set and whether it is empty, and make variable judgment more efficiently.
   (4) implode() and explode() are used for conversion between strings and arrays, and the processing efficiency is high.
3. Reasonable use of cache
   Caching is a common means to improve website performance. The use of cache in PHP can effectively reduce database queries and file read and write operations, and improve the response speed of the website. The following are some commonly used caching technologies:
   (1) Use memory cache to store frequently accessed data, such as Memcached or Redis.
   (2) Use file caching to store complex calculation results or database query results, such as caching JSON data into files.

2. Performance optimization

1. Reduce database queries
   Database queries are one of the bottlenecks of website performance. If the number of database queries can be reduced, it can be significantly improved. Website speed. The following are some commonly used optimization techniques:
   (1) Using indexes can speed up queries.
   (2) Use connection queries and nested queries to reduce the number of queries.

Sample code 1: Using index

// 创建索引
CREATE INDEX idx_name ON users (name);

// 使用索引查询
SELECT * FROM users WHERE name = 'John';

Sample code 2: Connection query

// 使用连接查询
SELECT orders.order_id, customers.name
FROM orders
INNER JOIN customers ON orders.customer_id = customers.customer_id;

2. Reasonable use of cache
   In addition to caching technology, you can also Reduce database queries through other methods:
   (1) Use an ORM (Object-Relational Mapping) framework, such as Laravel's Eloquent ORM, to directly use model objects for database operations, reducing the chance of handwritten SQL statements.
   (2) Using batch insert and batch update operations can reduce the number of communications between the database and PHP.

Sample Code 3: Using Eloquent ORM

// 定义用户模型
class User extends Model {
    protected $table = 'users';
}

// 查询用户列表
$users = User::where('age', '>', 18)->get();

3. Optimizing file reading and writing
   File reading and writing is also a common performance bottleneck. The following are some commonly used optimization techniques:
   (1) Use file cache to reduce read and write operations on files.
   (2) Merge CSS and JavaScript files to reduce the number of HTTP requests.
   (3) Use caching technology, such as CDN (Content Delivery Network), to cache static resources on multiple servers to speed up the loading of resources.

Sample Code 4: Merging CSS and JavaScript files

<!DOCTYPE html>
<html>
<head>
    <link rel="stylesheet" href="styles.css">
    <script src="scripts.js"></script>
</head>
<body>
    <!-- 网页内容 -->
</body>
</html>

Conclusion:
By following writing specifications and performance optimization practices, the speed and performance of PHP websites can be significantly improved . Proper use of cache, reduction of database queries and file read and write operations and other optimization techniques can make the website more responsive and user-friendly. In actual development, developers should choose appropriate writing specifications and performance optimization methods based on their own needs and project scale to achieve better website performance.

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