How can the code provided in the forum thread be improved or optimized for better performance when processing a large number of emails?

The issue with the code provided in the forum thread is that it processes each email one by one, which can be inefficient when dealing with a large number of emails. To optimize the code for better performance, we can use batch processing to handle multiple emails at once.

// Retrieve all emails in batches
$emails = get_emails_in_batches();

// Process each batch of emails
foreach ($emails as $batch) {
    foreach ($batch as $email) {
        // Process the email
        process_email($email);
    }
}

// Function to retrieve emails in batches
function get_emails_in_batches() {
    $batchSize = 100; // Set the batch size
    $totalEmails = get_total_emails(); // Get the total number of emails
    $numBatches = ceil($totalEmails / $batchSize);

    $emails = [];
    for ($i = 0; $i < $numBatches; $i++) {
        $offset = $i * $batchSize;
        $batch = get_emails($offset, $batchSize); // Get emails from offset with batch size
        $emails[] = $batch;
    }

    return $emails;
}

// Function to process an email
function process_email($email) {
    // Processing logic here
}

// Function to get the total number of emails
function get_total_emails() {
    // Retrieve total number of emails
}

// Function to get emails with offset and limit
function get_emails($offset, $limit) {
    // Retrieve emails with offset and limit
}