PHP server actively sends data to the client solution

1. Use a hidden iframe on the client, and its src points to the control code on the server, such as server.php

2. In server.php, use while to implement a never-ending request, and within the loop, implement breakpoints, such as sleep( 2), which means looping every 2 seconds

3. Output the fragment code to the client in each loop

echo "";

ob_flush();

flush();

The overall server-side test code is implemented as follows:

        $i = 0;
        while ($i < 20){
            echo '';
            ob_flush();
            flush();
            sleep(2);
            $i++;
        }

The above introduces the solution for the PHP server to actively send data to the client, including the relevant content. I hope it will be helpful to friends who are interested in PHP tutorials.