php mailer smtp connect（）未能通过gmail

Question

I have tried to send mail through gmail. I have seen other people solutions but it didn't work for me. What is the problem in my code?

Here is my output error

2017-06-27 13:53:54 SERVER -> CLIENT: 220 smtp.gmail.com ESMTP o131sm2910537wmd.26 - gsmtp 2017-06-27 13:53:54 CLIENT -> SERVER: EHLO localhost 2017-06-27 13:53:54 SERVER -> CLIENT: 250-smtp.gmail.com at your service, [213.55.85.206]250-SIZE 35882577250-8BITMIME250-STARTTLS250-ENHANCEDSTATUSCODES250-PIPELINING250 SMTPUTF8 2017-06-27 13:53:54 CLIENT -> SERVER: STARTTLS 2017-06-27 13:53:55 SERVER -> CLIENT: 220 2.0.0 Ready to start TLS SMTP Error: Could not connect to SMTP host. 2017-06-27 13:53:55 CLIENT -> SERVER: QUIT 2017-06-27 13:53:55 2017-06-27 13:53:55 SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting Mailer Error: SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting

Here is the source code

date_default_timezone_set('Etc/UTC');
require 'PHPMailer/PHPMailerAutoload.php';
$mail = new PHPMailer;
$mail->isSMTP();
$mail->SMTPDebug = 2;
$mail->Debugoutput = 'html';
$mail->Host = 'smtp.gmail.com';
$mail->Port = 587;
$mail->SMTPSecure = 'tls';
$mail->SMTPAuth = true;
$mail->Username = "[e-mail]";
$mail->Password = "xxxxxxx";
$mail->setFrom('[e-mail]', 'Support From HITD');
$mail->addAddress('[e-mail]', 'Hassen Jibril');
$mail->Subject = 'PHPMailer GMail SMTP test';
$mail->msgHTML("MUKERA 123");
$mail->AltBody = 'This is a plain-text message body';
if (!$mail->send()) {
echo "Mailer Error: " . $mail->ErrorInfo;
} else {
    echo "Message sent!";
}