What steps can be taken to troubleshoot and resolve issues with email content appearing as "10,000 komische Zeichen" when sending attachments via PHP?

Issue: The problem of email content appearing as "10,000 komische Zeichen" when sending attachments via PHP can be caused by encoding issues. To resolve this, you can set the proper encoding for the email content and attachments using PHP's mb_encode_mimeheader() function. PHP Code Snippet: 

// Set the proper encoding for the email content and attachments
$subject = 'Subject of the email';
$subject = mb_encode_mimeheader($subject, 'UTF-8');

// Set the headers for the email
$headers = 'MIME-Version: 1.0' . "\r\n";
$headers .= 'Content-type: text/html; charset=UTF-8' . "\r\n";
$headers .= 'From: sender@example.com' . "\r\n";

// Send the email with attachments
$attachments = array('path/to/file1.pdf', 'path/to/file2.jpg');
$boundary = md5(uniqid(time()));
$headers .= 'Content-Type: multipart/mixed; boundary="' . $boundary . '"' . "\r\n\r\n";

$message = '--' . $boundary . "\r\n";
$message .= 'Content-Type: text/html; charset=UTF-8' . "\r\n";
$message .= 'Content-Transfer-Encoding: 8bit' . "\r\n\r\n";
$message .= 'Content of the email' . "\r\n\r\n";

foreach ($attachments as $file) {
    $message .= '--' . $boundary . "\r\n";
    $message .= 'Content-Type: application/octet-stream; name="' . basename($file) . '"' . "\r\n";
    $message .= 'Content-Transfer-Encoding: base64' . "\r\n";
    $message .= 'Content-Disposition: attachment; filename="' . basename($file) . '"' . "\r\n\r\n";
    $message .= chunk_split(base64_encode(file_get_contents($file))) . "\r\n";
}

$message .= '--' . $boundary . '--';

// Send the email
mail('recipient@example.com', $subject, $message, $headers);

Keywords

PHP email attachments encoding troubleshooting character encoding

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