在PHP郵件（）函數中使用常量時遇到問題

Question

我已閱讀常量和mail（）函數的php.net文檔，但我仍然無法解決當前的問題。

我想建立一個註冊腳本，當表單上的所有內容都正確並通過一些正則表達式檢查時，將用戶添加到數據庫並執行兩項操作：顯示感謝頁面，並通過電子郵件發送電子郵件地址提供了一個感謝信。

if(empty($reg_errors)) { 
     $q = "SELECT email, username FROM users WHERE email = '$e' OR username = '$u'"; //the mysql query to check for dupe emails/users 
     $r = mysqli_query($dbc, $q); 
     $rows = mysqli_num_rows($r); 
     if($rows==0) {         // no dupes of email or user, so let's add them into the DB! 
      $q = "INSERT INTO users(username,email,pass,first_name,last_name,date_expires) VALUES('$u','$e','".get_password_hash($p)."','$fn','$ln',ADDDATE(NOW(),INTERVAL 1 MONTH))"; 
      $r = mysqli_query($dbc, $q); 

      //asks DB if a new row was created, and if so, thanks user for registration on the site & sends an email to their email. 
      //if query doesnt work, an error is triggered 
      if(mysqli_affected_rows($dbc)==1) { 
       echo '<h3>Thanks!</h3><p>Thank you for registering! You may now log in and access the site\'s content.</p>'; 
       $body = "Thanks for registering at Knowledge is Power. We greatly appreciate your interest in our services.\n\n"; 
       mail($_POST['email'],'Registration Confirmation for Knowledge is Power',$body, 'From:DEVEMAIL'); 
       include('./includes/footer.inc.php'); 
       exit(); 
      } else { 
       trigger_error("You could not be registered due to a system error. W apologize for any inconvenience."); 
      } 
     } 

我成立了DEVEMAIL不斷在我的config.inc.php文件像這樣：

define('DEVEMAIL','something@thisplace.com');

到目前爲止，我此腳本的測試，將這些用戶添加到數據庫並顯示感謝信息，但是當它發送感謝電子郵件時，它來自我的通用主機電子郵件地址，而不是我爲常量設置的電子郵件。我是否正確地在mail（）函數中格式化常量？任何感謝，將不勝感激。

編輯：郵件服務器已配置，並正在研究創建預準備語句。非常感謝有用的建議。

Answer 1

你想你已經配置了郵件服務器

'From:'.DEVEMAIL 

常量不加引號