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How can one optimize PHP code for better performance, especially when dealing with large amounts of data?

To optimize PHP code for better performance when dealing with large amounts of data, one can utilize techniques such as caching, minimizing database queries, using efficient data structures, and optimizing loops and functions.

php 
// Example of optimizing PHP code by caching database query results

// Initialize a cache array to store query results
$cache = [];

function fetchData($id) {
    global $cache;
    
    if (isset($cache[$id])) {
        return $cache[$id]; // Return cached result if available
    } else {
        // Perform database query
        $result = // Query to fetch data with $id
        
        // Store result in cache
        $cache[$id] = $result;
        
        return $result;
    }
}

// Usage example
$data = fetchData($id);

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