将 php 邮件投递到特殊字符电子邮件地址，例如 äüö

Question

我正在使用PayPal API，我需要将 php 电子邮件发送给具有特殊字符电子邮件地址的收件人。只要我不向 ü@example.com 发送电子邮件，ö@example.com 等等，一切正常......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。有人可以帮助我???

    <?php
    $message = "Bla"
    $item_name = $_POST['item_name'];
    $payer_email = $_POST['payer_email'];
    $email_from = '[e-mail]'; 
    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' . "rn";
    $headers .= 'Content-type: text/html; charset=UTF-8' . "rn";
    $headers .= "From: [e-mail] rn";
    $headers .= "Reply-To: [e-mail] rn";
    //Send the email!
    mail($to,$email_subject,$email_body,$headers);
    ?> 

Answer 1

你需要把它编码成utf8

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