Problems with sending emails asynchronously in php_PHP tutorial

Problems with sending emails asynchronously in php

Requirements:

In a certain system, after uploading the patch file of a product or releasing product update information, an email needs to be sent to the users who use the product (a large number of users). After sending, it will prompt that the sending is completed!

Our commonly used PHP code writing method is as follows:

<?php
// ......
//查找出所有使用该产品的用户email地址，假设存放在$email数组中  
for($i=0;$i<count($email);$i++){
   sendemail();
}
function sendemail(){
    //发送邮件代码  
}
//......

Suppose 100 emails are sent this time. What will be the result of this operation?

User experience: The user waits ->sending email is completed->returns information (it is very likely that the script execution times out during this period)

Due to the need to send a large number of emails, the PHP execution time is too long and the user is waiting impatiently. When apache or nginx waits for more than the allowed execution time, a timeout error will be returned. At this time, the user is not sure whether the operation was successful or not, and how many emails were sent.

From this we can see that the user experience of the above code is extremely poor and cannot successfully complete the task.

So how to solve this problem of poor user experience?

A concept is mentioned here, asynchronous execution

User experience: User waits ->Sent completed

Friends will ask, why is the sending link missing?

OK, when the user submits the request, the email sending task is transferred to a PHP program that handles the sending of letters separately. When the user sees "Sent Complete", the letter has not been sent yet. At this time, the mail-sending program is working hard in the background, sending letters one by one.

<?php  
$domain="www.phpernote.com";
$url="/sendEmail.php";
$par="email=1@163.com,2@163.com,3@163.com&time=".time();
$header="POST $url HTTP/1.0\r\n";
$header.="Content-Type: application/x-www-form-urlencoded\r\n";
$header.="Content-Length: ".strlen($par)."\r\n\r\n";
$fp=@fsockopen ($domain,80,$errno,$errstr,30);
fputs($fp,$header.$par);
fclose($fp);
echo '发送完毕';

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