What is class PHPMailer PHP?

PHPMailer is a popular open-source PHP library that provides a set of functions for sending email from a PHP script. It simplifies the process of sending emails and supports features such as attachments, HTML emails, SMTP authentication, and more. PHPMailer is widely used in PHP web applications for sending transactional emails, newsletters, and other types of email communications.

Here are some key features and aspects of PHPMailer:

1. **Sending Emails:** PHPMailer allows you to send emails using different transport methods, including the built-in `mail()` function, SMTP (Simple Mail Transfer Protocol), and others.

2. **Attachments:** You can easily attach files to your emails using PHPMailer, making it suitable for sending emails with images, documents, or other types of files.

3. **HTML Emails:** PHPMailer supports sending HTML-formatted emails, allowing you to create visually rich and formatted email content.

4. **SMTP Authentication:** If you choose to use SMTP for sending emails, PHPMailer supports authentication, which is crucial when sending emails through a mail server that requires authentication.

5. Secure Connections: PHPMailer supports secure connections using protocols such as SSL and TLS, enhancing the security of email communication.

Here's a basic example of using PHPMailer to send a simple email:

```php
<?php
use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\SMTP;
use PHPMailer\PHPMailer\Exception;

require 'vendor/autoload.php';

$mail = new PHPMailer(true);

try {
    //Server settings
    $mail->isSMTP();
    $mail->Host       = 'smtp.example.com';
    $mail->SMTPAuth   = true;
    $mail->Username   = 'youratexample.com';
    $mail->Password   = 'your-password';
    $mail->SMTPSecure = PHPMailer::ENCRYPTION_STARTTLS;
    $mail->Port       = 587;

    //Recipient
    $mail->setFrom('yoursatexample.com', 'Your Name');
    $mail->addAddress('recipientatexample.com', 'Recipient Name');

    //Content
    $mail->isHTML(true);
    $mail->Subject = 'Subject';
    $mail->Body    = 'This is the HTML message body';

    $mail->send();
    echo 'Message has been sent';
} catch (Exception $e) {
    echo "Message could not be sent. Mailer Error: {$mail->ErrorInfo}";
}
?>
```

This example demonstrates sending an HTML-formatted email using SMTP for authentication. You would need to customize the settings (host, username, password, etc.) according to your email provider or server configuration.

PHPMailer is available on GitHub, and you can find the latest version, documentation, and examples on the official repository: [PHPMailer GitHub Repository](https://github.com/PHPMailer/PHPMailer)