What are the potential issues with handling Umlaut characters in PHP email headers and content?

Handling Umlaut characters in PHP email headers and content can lead to encoding issues, where the characters may not display correctly in the recipient's email client. To solve this problem, you can use the mb_encode_mimeheader function to properly encode the Umlaut characters in the email headers. 

// Set the subject with Umlaut characters
$subject = 'Subject with Umlaut characters: Öäü';

// Encode the subject using mb_encode_mimeheader
$encoded_subject = mb_encode_mimeheader($subject, 'UTF-8');

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

// Send the email
mail('recipient@example.com', $encoded_subject, 'Email content with Umlaut characters: Öäü', $headers);

Keywords

Umlaut characters PHP email headers content encoding

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