//This file is used to store emails in to queue and access emails from queue
/**
* Class Queue
*/
class Queue
{
/**
* Path to the saved file
* @var string
*/
protected $path;
/**
* Queue constructor.
* @param $path
*/
public function __construct($path)
{
$this->path = $path;
}
/**
* Send an item to queue
*
* @param mixed $content - content to be send
* @return mixed - number of bytes written to the queue, or false on failure
*/
public function push($content)
{
//this will create file in the path that you provided
//EX: /Applications/MAMP/htdocs/queue/5a36b3db6bd933.13845696
$file = $this->path . uniqid(&＃39;&＃39;, true);
$data = serialize($content);
//Writing content that you passed to the 5a36b3db6bd933.13845696 file
return file_put_contents($file, $data);
}
/**
* This function will return all the items in the email queue list
*/
public function getNextItem()
{
$fileNames = scandir($this->path);
$fileNames = array_diff($fileNames, [&＃39;.&＃39;, &＃39;..&＃39;]);
$fileName = array_shift($fileNames);
if ($fileName !== null) {
$file = $this->path . $fileName;
$cOntents= file_get_contents($file);
if ($contents !== false) {
$object = unserialize($contents);
if ($object !== false) {
unlink($file);
return $object;
}
}
}
}
}

//This file is used to aut load all the classes that we need in this task
{
"require": {
"phpmailer/phpmailer": "5.*"
},
"autoload": {
"classmap": [
"classes"
]
}
}

# ┌───────────── minute (0 - 59)
# │ ┌───────────── hour (0 - 23)
# │ │ ┌───────────── day of month (1 - 31)
# │ │ │ ┌───────────── month (1 - 12)
# │ │ │ │ ┌───────────── day of week (0 - 6) (Sunday to Saturday;
# │ │ │ │ │ 7 is also Sunday on some systems)
# │ │ │ │ │
# │ │ │ │ │
# * * * * * command_to_execute
######crontab to process emails in queue ######
7 8 * * 4 php /Applications/MAMP/htdocs/public/process-queue.php

Send an email

Send

//This file is used to process all emails in teh queue
require dirname(__DIR__).&＃39;/vendor/autoload.php&＃39;;
$dir = dirname(__DIR__) . &＃39;/queue/&＃39;;
$queue = new Queue($dir);
$mail = $queue->getNextItem();
while ($mail !== null) {
$mail->isSMTP();
$mail->Host = Config::SMTP_HOST;
$mail->Port = Config::SMTP_PORT;
$mail->SMTPAuth = true;
$mail->Username = Config::SMTP_USER;
$mail->Password = Config::SMTP_PASSWORD;
$mail->SMTPSecure = &＃39;tls&＃39;;
$mail->CharSet = &＃39;UTF-8&＃39;;
if ($mail->send()) {
echo "message send \n";
} else {
echo "Mailer error" . $mail->ErrorInfo . "\n";
}
}

//This is used to send email in to queue
/**
* Start the timer
*/
$start_time = microtime(true);
/*Autoload file from phpmailer library
you can download this library from composer and our custom classes*/
require "../vendor/autoload.php";
//Enable errors to display
ini_set(&＃39;display_errors&＃39;, 1);
ini_set(&＃39;display_startup_errors&＃39;, 1);
error_reporting(E_ALL);
//creating object for PHPMailer class in library
$mail = new PHPMailer();
try {
//configuration to send email
$mail->isSMTP();
$mail->Host = Config::SMTP_HOST;
$mail->Port = Config::SMTP_PORT;
$mail->SMTPAuth = true;
$mail->Username = Config::SMTP_USER;
$mail->Password = Config::SMTP_PASSWORD;
$mail->SMTPSecure = &＃39;tls&＃39;;
$mail->CharSet = &＃39;UTF-8&＃39;;
//Allow to display more debugging information from phpmailer
//$mail->SMTPDebug = 2;
//Send an email
$mail->setFrom(&＃39;phpmailmail@gmail.com&＃39;, &＃39;gopibabu&＃39;);
$mail->addAddress(&＃39;gopinyca.php@gmail.com&＃39;);
$mail->Subject = &＃39;Testing PHPMailer Messages asynchronous&＃39;;
$mail->Body = &＃39;Sending email asynchronously&＃39;;
/**
* Add email to queue
*/
$dir = dirname(__DIR__).&＃39;/queue/&＃39;;
$queue = new Queue($dir);
$queue->push($mail);
} catch (Exception $e) {
echo &＃39;Message could not be queued.&＃39;;
echo &＃39;Mailer Error: &＃39; . $mail->ErrorInfo;
}
$end_time = microtime(true);
$time = number_format($end_time - $start_time, 5);
/**
* Return to index.php
*/
header("Location:emailIndex.php?time=$time");
exit();