How can PHP developers ensure that Umlaut characters are correctly displayed in emails sent through a form?

Umlaut characters may not be displayed correctly in emails sent through a form due to encoding issues. To ensure they are displayed correctly, PHP developers can use the mb_encode_mimeheader function to encode the subject of the email with the appropriate character set. 

$subject = 'Subject with Umlaut characters: äöü';
$subject = mb_encode_mimeheader($subject, 'UTF-8', 'Q');

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

mail('recipient@example.com', $subject, 'Email body text', $headers);

Keywords

PHP Umlaut characters email form encoding

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