What are the best practices for handling email sending in PHP to avoid duplicate emails?

To avoid sending duplicate emails in PHP, one of the best practices is to keep track of the emails that have been sent using a unique identifier like the recipient's email address. Before sending an email, check if it has already been sent to that recipient to prevent duplicates. 

// Check if the email has already been sent to the recipient
function hasEmailBeenSent($recipientEmail) {
    // Code to check if the email has been sent, e.g., querying a database
    return false; // Return true if email has been sent, false otherwise
}

// Send email only if it has not been sent before
function sendEmail($recipientEmail, $subject, $message) {
    if (!hasEmailBeenSent($recipientEmail)) {
        // Code to send the email
        // Remember to update the tracking mechanism after sending the email
    }
}

Keywords

PHP email sending duplicate emails prevention handling

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