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我正在尝试编辑 PHP 联系表单，以便客户可以编写特殊字符，例如 ščťžýá 等。在我的邮件中，这些字符用�表示。我的PHP经验很差，你能告诉我，我做错了什么吗？

<?php


if(isset($_POST['email'])) {


    $email_to = "my mail";
    $email_subject = "Sprava z formularu";


    function died($error) {
        echo "Formular nebol odoslany.";
        echo "Vyskytli sa tieto chyby:<br /><br />";
        echo $error."<br /><br />";
        echo "Vratte sa a opravte tieto chyby.<br /><br />";
        die();
    }

    if(!isset($_POST['first_name']) ||
        !isset($_POST['last_name']) ||
        !isset($_POST['email']) ||
        !isset($_POST['telephone']) ||
        !isset($_POST['comments'])) {
        died('Vyskytol sa problem s vasim formularom.');      
    }

    $first_name = $_POST['first_name']; // required
    $last_name = $_POST['last_name']; // required
    $email_from = $_POST['email']; // required
    $telephone = $_POST['telephone']; // not required
    $comments = $_POST['comments']; // required

    $error_message = "";
    $email_exp = '/^[A-Za-z0-9._%-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}$/';
  if(!preg_match($email_exp,$email_from)) {
    $error_message .= 'Adresa, ktoru ste zadali je neplatna.<br />';
  }
    $string_exp = "/^[A-Za-z .'-]+$/";
  if(strlen($first_name) < 2) {
    $error_message .= 'Meno, ktore ste zadali je neplatne.<br />';
  }
  if(strlen($last_name) < 2) {
    $error_message .= 'Priezvisko, ktore ste zadali je neplatne.<br />';
  }
  if(strlen($comments) < 2) {
    $error_message .= 'Sprava, ktoru ste zadali je neplatna.<br />';
  }
  if(strlen($error_message) > 0) {
    died($error_message);
  }
    $email_message = "Udaje z formulara:\n\n";

    function clean_string($string) {
      $bad = array("content-type","bcc:","to:","cc:","href");
      return str_replace($bad,"",$string);
    }

    $email_message .= "Meno: ".clean_string($first_name)."\n";
    $email_message .= "Priezvisko: ".clean_string($last_name)."\n";
    $email_message .= "Email: ".clean_string($email_from)."\n";
    $email_message .= "Telefon: ".clean_string($telephone)."\n";
    $email_message .= "Sprava: ".clean_string($comments)."\n";


$text = iconv('utf-8', 'iso-8859-2', $text);
$headers = 'From: '.$email_from."\r\n" . "MIME-Version: 1.0\r\n" . "Content-Type: text/plain; charset=windows-1250".
'Reply-To: '.$email_from."\r\n" .
'X-Mailer: PHP/' . phpversion();
@mail($email_to, $email_subject, $email_message, $headers); 
?>
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