What are the best practices for encoding email subjects in PHP to ensure compatibility with different mail servers?

When encoding email subjects in PHP, it's important to use the mb_encode_mimeheader function to ensure compatibility with different mail servers. This function will properly encode special characters and ensure that the subject is displayed correctly in various email clients. 

$subject = 'Subject with special characters é, ü, ñ';
$subject_encoded = mb_encode_mimeheader($subject, 'UTF-8', 'Q');
$headers = 'Content-Type: text/plain; charset=UTF-8' . "\r\n";
$headers .= 'Subject: ' . $subject_encoded . "\r\n";

// Send email using $headers

Keywords

email encoding PHP mail servers compatibility best practices

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