폼메일 수정 문의드립니다.

<meta charset="utf-8"><?phpif(isset($_POST['email'])) {         	$email_to = "이메일 넣었음.";	$email_subject = "[폼메일] 문의사항입니다.";	$email_subject = '=?UTF-8?B?'.base64_encode($email_subject).'?=';               function died($error) {        // your error code can go here        echo "<script> alert('메일발송을 실패하였습니다.');";		echo "history.go(-1);";		echo "</script>";        die();    }         // validation expected data exists    if(!isset($_POST['first_name']) ||        !isset($_POST['email']) ||        !isset($_POST['telephone']) ||        !isset($_POST['comments'])) {        died('We are sorry, but there appears to be a problem with the form you submitted.');           }         $first_name = $_POST['first_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)) {    $error_message .= 'The Email Address you entered does not appear to be valid.<br />';  }      if(strlen($comments) < 2) {    $error_message .= 'The Comments you entered do not appear to be valid.<br />';  }  if(strlen($error_message) > 0) {    died($error_message);  }    $email_message = "";         function clean_string($string) {      $bad = array("content-type","bcc:","to:","cc:","href");      return str_replace($bad,"",$string);    }         $email_message .= "이름 : ".clean_string($first_name)."\n\n";    $email_message .= "이메일 : ".clean_string($email_from)."\n\n";    $email_message .= "연락처 : ".clean_string($telephone)."\n\n";    $email_message .= "문의사항 : ".clean_string($comments)."\n\n";          // create email headers$headers = 'From: '.$email_from;// 제목이 깨질경우 아래 캐릭터셋 적용 @mail($email_to, $email_subject, $email_message, $headers);  ?> <!-- include your own success html here --> <script>alert ("메일이 발송되었습니다.\n빠른 시일안에 답변드리겠습니다.");location.href='../';</script> <?php}?>