What are the potential pitfalls of not encoding the subject in PHP mail according to RFC standards?

Not encoding the subject in PHP mail according to RFC standards can lead to issues with special characters or non-ASCII characters not being displayed correctly in the recipient's email client. To solve this, you should use the mb_encode_mimeheader function to properly encode the subject before sending the email. 

$subject = 'Subject with special characters or non-ASCII characters';

$subject_encoded = mb_encode_mimeheader($subject, 'UTF-8');

// Use the encoded subject in the mail function
mail('recipient@example.com', $subject_encoded, 'Message body', 'From: sender@example.com');

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PHP mail encoding RFC standards pitfalls email security

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