将php邮件发送到特殊字符的电子邮件地址，如äüö；

我使用贝宝API，我需要将php电子邮件发送给电子邮件地址带有特殊字符的收件人。只要我不向ü@example.com、ö@example.com等发送电子邮件，一切都很好……但自2012年以来，这些字符存在于电子邮件地址中，我无法让php正确理解这些字符。有人能帮我吗

    <?php
    $message = "Bla"
    $item_name = $_POST['item_name'];
    $payer_email = $_POST['payer_email'];

    $email_from = 'office@rhythm-one.com'; 
    address
    $email_subject = '=?UTF-8?
    B?'.base64_encode('Bestellbestätigung').'?='; 
    $email_body = "$message";

    $to = $_POST['payer_email'];//<== This could contain ä,ü or ö
    $headers  = 'MIME-Version: 1.0' . "\r\n";
    $headers .= 'Content-type: text/html; charset=UTF-8' . "\r\n";
    $headers .= "From: office@rhythm-one.com \r\n";
    $headers .= "Reply-To: office@rhythm-one.com \r\n";
    //Send the email!
    mail($to,$email_subject,$email_body,$headers);
    ?> 

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您需要将其编码为utf8

$to = utf8_encode($_POST['payer_email'];

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您需要将其编码为utf8

$to = utf8_encode($_POST['payer_email'];