PhpMailer Redirect Error Message

[phpnewbie08]

I am using the below code for a webform but getting the below error messages. Please help. Thanks.

Error 1

Warning: Cannot modify header information - headers already sent by (output started at class.phpmailer.php:1370) in processform.php on line 63

Error 2 - With this error message the attachment is not required but can upload max 4 files.

Could not access file: Array Could not access file: Array Could not access file: Array Could not access file: Array

<?php
    $errors = array();
    if ('POST' === $_SERVER['REQUEST_METHOD'])
    {
        $name           = sanitize($_POST['name']);
        $email                 = sanitize($_POST['email']);

        if (empty($name))
        {
            $errors['name'] = "Please provide name.";
        }
 
        if (!filter_var($email, FILTER_VALIDATE_EMAIL))
        {
            $errors['email'] = "Please provide a valid email address.";
        }
           // If there are no errors let's process the payment
        if (count($errors) === 0)
        {
            
    require("class.phpmailer.php");
    
    $mail = new PHPMailer();
    $mail->From     = $email;
    $mail->AddAddress("myfriend@example.net");

    $mail->Subject  = "Test";
    $mail->Body     = "some message here.";
    $mail->WordWrap = 50;

    $mail->AddAttachment($_FILES['file']['tmp_name']);
    $mail->AddAttachment($_FILES['file']['tmp_name']);
    $mail->AddAttachment($_FILES['file']['tmp_name']);
    $mail->AddAttachment($_FILES['file']['tmp_name']);

    $mail->Send();
    
    exit(header("Location: thankyou.php"));
            }    }

function sanitize($value)
    {
        return trim(strip_tags($value));
    }
?>

[NogDog]

If you defined your HTML file inputs using the "[]" notation for its name, then instead of this...

    $mail->AddAttachment($_FILES['file']['tmp_name']);
    $mail->AddAttachment($_FILES['file']['tmp_name']);
    $mail->AddAttachment($_FILES['file']['tmp_name']);
    $mail->AddAttachment($_FILES['file']['tmp_name']); 

...you'll want to do something like this...

foreach($FILES['file']['tmp_name'] as $file_name) {
    if(!empty($file_name)) {
        $mail->AddAttachment($file_name);
    }
} 

I'm guessing for now that the error message #2 is coming from that code, and is actually happening before error message #1, which is caused by the output of the #2 errors. If that's not the case, then it could be something else generating output, such as a BOM (byte order mark) before the opening <?php tag (if saving your PHP file as UTF-8, make sure it is without a BOM). If that's not it, then you might want to start the script with an ob_start() to buffer output.

[carygh]

Thanks nogdog, ob_start() helps the first problem.