In what ways can PHP developers optimize their code to ensure efficient and effective newsletter distribution without duplicates?

To ensure efficient and effective newsletter distribution without duplicates, PHP developers can optimize their code by using a database to store email addresses and checking for duplicates before sending out newsletters. 

// Connect to the database
$connection = new mysqli("localhost", "username", "password", "database");

// Check if email address already exists in the database
$email = "test@example.com";
$query = "SELECT * FROM subscribers WHERE email = '$email'";
$result = $connection->query($query);

if ($result->num_rows == 0) {
    // Add email address to the database
    $insertQuery = "INSERT INTO subscribers (email) VALUES ('$email')";
    $connection->query($insertQuery);

    // Send out newsletter
    // Code to send newsletter goes here
} else {
    echo "Email address already exists in the database.";
}

// Close the database connection
$connection->close();

Keywords

PHP optimization newsletter distribution duplicates efficiency

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