In what scenarios is it not necessary to explicitly close connections and statements in PHP when interacting with a MySQL database?

In PHP, it is not necessary to explicitly close connections and statements when interacting with a MySQL database if you are using PDO (PHP Data Objects) or MySQLi (MySQL Improved) with the default behavior. These database extensions automatically close connections and statements when the script finishes executing or when the database object is destroyed. However, it is still considered good practice to explicitly close connections and statements to free up resources and ensure proper cleanup. 

// Example of using PDO to interact with a MySQL database without explicitly closing connections and statements

try {
    $pdo = new PDO("mysql:host=localhost;dbname=mydatabase", "username", "password");
    
    $stmt = $pdo->prepare("SELECT * FROM users");
    $stmt->execute();
    
    $result = $stmt->fetchAll(PDO::FETCH_ASSOC);
    
    foreach($result as $row) {
        echo $row['username'] . "<br>";
    }
    
    // Connection and statement will be automatically closed when script finishes executing
} catch(PDOException $e) {
    echo "Error: " . $e->getMessage();
}

Keywords

PHP MySQL database connections resource management automatic closing

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