SMTP 连接(） 失败..当我尝试从我的 PHP 文件发送邮件时

>我一直在尝试从我的 PHP 文件发送邮件，我遇到了这样的错误

**"SMTP ERROR: Failed to connect to server: php_network_getaddresses: getaddrinfo failed: No such host is known. (0) SMTP connect() failed."**

正处于项目的截止日期，如果有人知道我在这里所做的解决方案或错误，请分享和帮助。我在这里分享我的代码...

<?php
    require("C:/xampp/htdocs/conference/PHPMailer-master/class.phpmailer.php");
    require("C:/xampp/htdocs/conference/PHPMailer-master/class.smtp.php");
    $mail = new PHPMailer();
    $mail->IsSMTP();  // telling the class to use SMTP
    $mail->SMTPDebug = 1; // debugging: 1 = errors and messages, 2 = messages only
    $mail->SMTPAuth   = true; // SMTP authentication
    $mail->SMTPSecure = 'tls'; // secure transfer enabled REQUIRED for GMail
    $mail->Host       = "smtp.gmail.com"; // SMTP server
    $mail->Port       = 465; // SMTP Port
    $mail->Username   = "my email address"; // SMTP account username
    $mail->Password   = "my password";        // SMTP account password
    $mail->SetFrom('my email address', 'xxxx'); // FROM
    $mail->AddReplyTo('my email address', 'xxxx'); // Reply TO
    $mail->AddAddress('someone email address', 'yyyy'); // recipient email
    $mail->Subject    = "First SMTP Message"; // email subject
    $mail->Body       = "Hi! 'n'n This is my first e-mail sent through Google SMTP using PHPMailer.";
    if(!$mail->Send()) {
      echo 'Message was not sent.';
      echo 'Mailer error: ' . $mail->ErrorInfo;
    } else {
      echo 'Message has been sent.';
    }
?>