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PHP Code Overhead

Another issue that can arise is PHP code overhead. This can be caused by improper use of Prestashop functions, an excessive number of database queries, or inefficient resource usage.

To solve this problem, we need to analyze the module's code and identify the functions that are called most frequently and how we can optimize them.

Module Code Analysis​

We start by using the Profiler to identify critical points in the module code. Once identified, we can exclude the rest of the code and focus on the problematic parts.

Optimization Steps​

  1. Using the Profiler:

    • Enable the Prestashop Profiler as previously described to identify the functions and queries that take the most time.

  2. Identifying Critical Functions:

    • Analyze the Profiler report to see which module functions are called most frequently and which consume the most resources.

  3. Optimizing Functions:

    • Reduce the number of database queries: check if it's possible to combine multiple queries into one or if some queries can be eliminated or replaced with more efficient methods.
    • Cache responses: implement caching mechanisms for functions that perform costly or time-consuming operations.
    • Use native functions: ensure you are using Prestashop's native functions optimized for performance.

Optimization Example​

Suppose a module function performs many database queries to retrieve product information. We can optimize it by combining the queries and implementing a caching system.

public function getProductsInfo($productIds)
{
    // Check if data is already cached
    $cacheKey = 'products_info_' . implode('_', $productIds);
    if (Cache::isStored($cacheKey)) {
        return Cache::retrieve($cacheKey);
    }

    // Execute a single query to retrieve product information
    $sql = 'SELECT * FROM ' . _DB_PREFIX_ . 'product WHERE id_product IN (' . implode(',', array_map('intval', $productIds)) . ')';
    $result = Db::getInstance()->executeS($sql);

    // Store the results in cache
    Cache::store($cacheKey, $result);

    return $result;
}

Conclusion​

Optimizing PHP code overhead requires a thorough analysis of critical functions and database queries. Using the Prestashop Profiler to identify weak points and implementing caching and query optimization strategies can significantly reduce the impact on site performance. Careful and optimized code management will ensure a smoother and more responsive user experience.