send-email-using-gmail-smtp-server-through-php-mailer for PHP version 5.6 and above

Below code working fine in php 5.2 and php 5.4 and PHP5.6 same code given valid SSL error  so we have to use from  $mail->SMTPSecure = 'ssl'; update $mail->SMTPSecure = 'tls'; and use port 587 and comment $mail->isSMTP(); function. Not known how but it working and able to send mail

$mail = new PHPMailer(); // create a new object
$mail->IsSMTP(); // enable SMTP
$mail->SMTPDebug = 1; // debugging: 1 = errors and messages, 2 = messages only
$mail->SMTPAuth = true; // authentication enabled
$mail->SMTPSecure = 'ssl'; // secure transfer enabled REQUIRED for Gmail
$mail->Host = "smtp.gmail.com";
$mail->Port = 465; // or 587
$mail->IsHTML(true);
$mail->Username = "email@gmail.com";
$mail->Password = "password";
$mail->SetFrom("example@gmail.com");
$mail->Subject = "Test";
$mail->Body = "hello";
$mail->AddAddress("email@gmail.com");

 if(!$mail->Send()) {
    echo "Mailer Error: " . $mail->ErrorInfo;
 } else {
    echo "Message has been sent";
 }