Code Refactoring Strategies in PHP Application Performance Optimization

Code refactoring is key to PHP application performance optimization and involves changing existing code to improve performance. Practical strategies include caching query results to avoid repeated database queries. Function decomposition breaks large functions into smaller modules. Duplicate code elimination uses functions or loops to eliminate redundant code. Use data structures to organize data to improve access efficiency. Reduce branch judgments and use switch-case or if-else statements to optimize nested if-else chains. Optimize database queries using indexes, restricted result sets, and cached queries.

Practical code refactoring strategy in PHP application performance optimization

Code refactoring is the key to optimizing PHP application performance Strategy. It involves making changes to existing code without changing its underlying behavior to improve readability, maintainability, and efficiency.

Practical case: caching query results

Consider the following function that queries the database:

function get_users() {
  return DB::select('SELECT * FROM users');
}

This function will execute a database query every time it is called, which may Will reduce performance. To optimize it, we can use the cache to store the query results:

function get_users_cached() {
  static $users;  // 静态变量存储缓存结果
  if (!isset($users)) {
    $users = DB::select('SELECT * FROM users');
  }
  return $users;
}

Now, this function only needs to execute the query once and then return the results from the cache, significantly improving the performance of repeated calls.

Other refactoring strategies

• Function decomposition: Decompose large functions into smaller, reusable modules.
• Duplicate Code Elimination: Use functions or loops to eliminate duplicate code blocks.
• Use data structures: For example, arrays or objects, organize data to improve access efficiency.
• Reduce branch judgment: Use switch-case or if-else statements instead of nested if-else chains.
• Optimize database queries: Use indexes, restricted result sets, and cached queries to optimize database interactions.

Best Practices

• Use version control: Create a backup of your code before refactoring.
• Refactor in small chunks: Refactor one small module at a time to reduce the possibility of errors.
• Unit testing: Run unit tests after refactoring to ensure their correctness.
• Continuous Integration: Automate the continuous integration process to detect and fix any build or test failures immediately after refactoring.

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