Error: Class 'PHPMailer' not found

Question

Error: Fatal error: Uncaught Error: Class 'PHPMailer' not found in C:\xampp\htdocs\php-mailer\index.php:4 Stack trace: #0 {main} thrown in C:\xampp\htdocs\php-mailer\index.php on line 4

My PHP Code here:

require("src/PHPMailer.php");
require("src/Exception.php");
$mail = new PHPMailer();  

$mail->IsSMTP();                                      
$mail->Host = 'smtp.gmail.com'; 
$mail->SMTPAuth = true;     // turn on SMTP authentication
$mail->Username = "gmail id";  // SMTP username
$mail->Password = "mypassword"; // SMTP password

$mail->From = "opensourcesivaprakash@gmail.com";
$mail->FromName = "Mailer";
$mail->AddAddress("siva.sing.sivan@gmail.com", "Josh Adams");
$mail->AddAddress("sp");                  // name is optional
//$mail->AddReplyTo("opensourcesivaprakash@gmail.com", "Information");

$mail->WordWrap = 50;                                 // set word wrap to 50 characters
//$mail->AddAttachment("/var/tmp/file.tar.gz");         // add attachments
//$mail->AddAttachment("/tmp/image.jpg", "new.jpg");    // optional name
$mail->IsHTML(true);                                  // set email format to HTML

$mail->Subject = "Here is the subject";
$mail->Body    = "This is the HTML message body in bold!";
$mail->AltBody = "This is the body in plain text for non-HTML mail clients";

if(!$mail->Send())
{
   echo "Message could not be sent. 
";
   echo "Mailer Error: " . $mail->ErrorInfo;
   exit;
}

echo "Message has been sent";

Please let me know what mistake I made here in my code.

Answer 1

It's because you've not considered PHPMailer's namespace. Do one of these two things:

Change your instantiation to use a fully-qualified class name (FQCN):

$mail = new PHPMailer\PHPMailer\PHPMailer();

Alternatively, define the import at the top of your file, before you load the classes:

use PHPMailer\PHPMailer\PHPMailer;

This will allow your existing new PHPMailer line to work.

All the examples provided with PHPMailer use the latter approach, and it's also described in the troubleshooting guide.