How to improve PHP function performance through code review?

Code review is a key step to improve the performance of PHP functions. By checking the code to find complexity, optimizing database queries, avoiding memory leaks, optimizing shrink time, and utilizing cache, you can effectively improve application efficiency. Taking the get_products() function as an example, performance has been significantly improved by optimizing queries, obtaining data in batches, and improving the hierarchical structure.

Improve PHP function performance through code review

Introduction
Code review is to improve PHP function performance Important steps for performance. By carefully examining the code and identifying potential bottlenecks, steps can be taken to optimize performance, thereby increasing the overall efficiency of the application.

Code Review Tips

• Look for Complexity: Be aware of any complex or lengthy if/else statements, loops, or nested functions transfer.
• Identify database queries: Check the optimization level of database queries and look for any unnecessary joins or groupings.
• Avoid memory leaks: Ensure that objects and resources are released correctly to prevent memory leaks.
• Optimize the shrinking time: Analyze the code execution time and find ways to reduce the shrinking time.
• Utilize caching: Consider using a caching mechanism to store frequently accessed data to reduce database queries.

Practical case

Suppose there is a PHP function get_products() used to get the product list:

function get_products() {
    $connection = connect_to_database();
    $query = "SELECT * FROM products";
    $result = mysqli_query($connection, $query);
    $products = [];
    while ($row = mysqli_fetch_assoc($result)) {
        $products[] = $row;
    }
    return $products;
}

Code Review

• Complexity: This function lacks a layered structure, which may lead to maintenance difficulties.
• Database query: The query does not specify any filter conditions, which may lead to unnecessary data retrieval.
• Performance bottleneck: The while loop may cause performance bottlenecks when the data set is large.

Optimized version

function get_products($category = null) {
    $connection = connect_to_database();
    $query = "SELECT * FROM products";
    if (!empty($category)) {
        $query .= " WHERE category = '$category'";
    }
    $result = mysqli_query($connection, $query);
    $products = mysqli_fetch_all($result, MYSQLI_ASSOC);
    return $products;
}

Optimization improvements

• Hierarchical structure: Moving database connections and queries to other functions improves modularity.
• Optimize query: Add filter conditions to reduce unnecessary data retrieval.
• Batch acquisition: Use mysqli_fetch_all() to obtain data in batches and reduce the number of database calls.

Conclusion
By conducting regular code reviews, performance bottlenecks can be identified and steps can be taken to optimize them. By following best practices and leveraging the appropriate tools, you can significantly improve the performance of your PHP functions, thereby improving the overall efficiency of your application.

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