How can PHP code be optimized to ensure successful email form submissions with special characters like umlauts?

Special characters like umlauts can cause issues with email form submissions if not handled properly. To ensure successful submissions, the PHP code can be optimized by using the PHP `mb_encode_mimeheader()` function to encode the subject line with special characters before sending the email. 

<?php
$to = "recipient@example.com";
$subject = "Subject with ümläuts";
$message = "This is a test email with special characters ümläuts.";
$headers = "From: sender@example.com\r\n";
$headers .= "MIME-Version: 1.0\r\n";
$headers .= "Content-Type: text/plain; charset=UTF-8\r\n";
$subject = mb_encode_mimeheader($subject, "UTF-8", "Q");
mail($to, $subject, $message, $headers);
?>

Keywords

PHP email form submissions special characters umlauts optimization

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