kirim email dengan codeigniter dari locahost

gan mau nanya ni gimana carana kirim email dengan phpmailer dari localhost? saya sudah coba banyak cara tapi tetap error ni. code kayak gini :

 <?php
ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);
require 'phpmailer/PHPMailerAutoload.php';

$mail = new PHPMailer;
$mail->isSMTP();

$mail->SMTPDebug = 2;
$mail->Debugoutput = 'html';
$mail->Host = 'smtp.google.com';
$mail->Port = 465;
$mail->SMTPSecure = 'ssl';
$mail->SMTPAuth = true;
$mail->Username = "emailsaya@gmail.com";
$mail->Password = "passwordemailsaya";
$mail->setFrom('emailsaya@gmail.com', 'dari saya');
$mail->addReplyTo('emailsaya@gmail.com', 'replay ke saya');
$mail->addAddress('emailtujuan@gmail.com', 'kirim ke dia');
$mail->Subject = 'Email buat testing';
$mail->msgHTML("email ini hanya buat testing keperluan development", "");
$mail->AltBody = 'Ini Pesan jangan dibalas';
if (!$mail->send()) {
    echo "Ada Yang Error: " . $mail->ErrorInfo;
} else {
    echo "Berhasil di Send!";
}

errornya : SMTP ERROR: Failed to connect to server: php_network_getaddresses: getaddrinfo failed: No such host is known. (0) SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting Ada Yang Error: SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting

dulu pernah pake dan berhasil tapi kok sekarang error ya? atasinya gimana ya mohon bantuannya gan.