How can the problem of Umlaut characters not displaying correctly in emails be addressed in PHP?

Umlaut characters may not display correctly in emails due to encoding issues. To address this problem in PHP, you can use the mb_encode_mimeheader function to properly encode the subject line of the email with UTF-8 encoding. 

$subject = 'Äpfel und Birnen';
$encoded_subject = mb_encode_mimeheader($subject, 'UTF-8');

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

mail('recipient@example.com', $encoded_subject, 'This is the email body.', $headers);

Keywords

Umlaut characters emails PHP encoding UTF-8

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