What steps can be taken to improve the efficiency and functionality of PHP code for database queries and calculations?

To improve the efficiency and functionality of PHP code for database queries and calculations, you can utilize prepared statements for database queries to prevent SQL injection attacks and optimize query execution. Additionally, consider caching frequently accessed data to reduce the number of database queries and improve performance. For calculations, use built-in PHP functions and avoid unnecessary loops or complex logic to streamline the code. 

// Example of using prepared statements for database queries
$stmt = $pdo->prepare("SELECT * FROM users WHERE id = :id");
$stmt->bindParam(':id', $id, PDO::PARAM_INT);
$stmt->execute();
$user = $stmt->fetch();

// Example of caching frequently accessed data
if(!($data = apc_fetch('cached_data'))) {
    $data = fetchDataFromDatabase();
    apc_store('cached_data', $data, 3600); // Cache for 1 hour
}

// Example of using built-in PHP functions for calculations
$total = array_sum($numbers);

Keywords

MySQL PDO indexing query optimization performance tuning

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