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To send an email to several recipients at once using PHP mailer, you can use the following steps:

1. Import the PHPMailer library using the code below:

use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;

require 'vendor/autoload.php'; // This will load the PHPMailer library

1. Instantiate the PHPMailer class:

$mail = new PHPMailer(true);

1. Set the SMTP access details:

$mail->SMTPDebug = 0;
$mail->isSMTP();
$mail->Host = 'smtp.gmail.com'; // This can be changed to any SMTP host
$mail->SMTPAuth = true;
$mail->Username = 'youremail@gmail.com'; // Your email address
$mail->Password = 'yourpassword'; // Your email password
$mail->SMTPSecure = 'tls';
$mail->Port = 587;

1. Set the email details, such as the sender, recipient, subject, and content:

$mail->setFrom('youremail@gmail.com', 'Your Name');
$mail->addAddress('recipient1@example.com', 'Recipient 1');
$mail->addAddress('recipient2@example.com', 'Recipient 2');
$mail->Subject = 'Email Subject';
$mail->Body = 'Email content goes here.';

1. Use the send() method to send the email:

if ($mail->send()) {
  echo 'Email sent successfully.';
} else {
  echo 'Unable to send email. Error: ' . $mail->ErrorInfo;
}

By adding multiple recipients with the addAddress() method, you can send the same email to several recipients at once.