Run PHP Task Asynchronously

Question

I work on a somewhat large web application, and the backend is mostly in PHP. There are several places in the code where I need to complete some task, but I don\'t want to m

Answer 1

i think you should try this technique it will help to call as many as pages you like all pages will run at once independently without waiting for each page response as asynchronous.

cornjobpage.php //mainpage

    <?php

post_async("http://localhost/projectname/testpage.php", "Keywordname=testValue");
//post_async("http://localhost/projectname/testpage.php", "Keywordname=testValue2");
//post_async("http://localhost/projectname/otherpage.php", "Keywordname=anyValue");
//call as many as pages you like all pages will run at once independently without waiting for each page response as asynchronous.
            ?>
            <?php

            /*
             * Executes a PHP page asynchronously so the current page does not have to wait for it to     finish running.
             *  
             */
            function post_async($url,$params)
            {

                $post_string = $params;

                $parts=parse_url($url);

                $fp = fsockopen($parts['host'],
                    isset($parts['port'])?$parts['port']:80,
                    $errno, $errstr, 30);

                $out = "GET ".$parts['path']."?$post_string"." HTTP/1.1\r\n";//you can use POST instead of GET if you like
                $out.= "Host: ".$parts['host']."\r\n";
                $out.= "Content-Type: application/x-www-form-urlencoded\r\n";
                $out.= "Content-Length: ".strlen($post_string)."\r\n";
                $out.= "Connection: Close\r\n\r\n";
                fwrite($fp, $out);
                fclose($fp);
            }
            ?>

testpage.php

    <?
    echo $_REQUEST["Keywordname"];//case1 Output > testValue
    ?>

PS:if you want to send url parameters as loop then follow this answer :https://stackoverflow.com/a/41225209/6295712

Answer 2

I've used Beanstalkd for one project, and planned to again. I've found it to be an excellent way to run asynchronous processes.

A couple of things I've done with it are:

• Image resizing - and with a lightly loaded queue passing off to a CLI-based PHP script, resizing large (2mb+) images worked just fine, but trying to resize the same images within a mod_php instance was regularly running into memory-space issues (I limited the PHP process to 32MB, and the resizing took more than that)
• near-future checks - beanstalkd has delays available to it (make this job available to run only after X seconds) - so I can fire off 5 or 10 checks for an event, a little later in time

I wrote a Zend-Framework based system to decode a 'nice' url, so for example, to resize an image it would call QueueTask('/image/resize/filename/example.jpg'). The URL was first decoded to an array(module,controller,action,parameters), and then converted to JSON for injection to the queue itself.

A long running cli script then picked up the job from the queue, ran it (via Zend_Router_Simple), and if required, put information into memcached for the website PHP to pick up as required when it was done.

One wrinkle I did also put in was that the cli-script only ran for 50 loops before restarting, but if it did want to restart as planned, it would do so immediately (being run via a bash-script). If there was a problem and I did exit(0) (the default value for exit; or die();) it would first pause for a couple of seconds.

Answer 3

If you set the Content-Length HTTP header in your "Thank You For Registering" response, then the browser should close the connection after the specified number of bytes are received. This leaves the server side process running (assuming that ignore_user_abort is set) so it can finish working without making the end user wait.

Of course you will need to calculate the size of your response content before rendering the headers, but that's pretty easy for short responses (write output to a string, call strlen(), call header(), render string).

This approach has the advantage of not forcing you to manage a "front end" queue, and although you may need to do some work on the back end to prevent racing HTTP child processes from stepping on each other, that's something you needed to do already, anyway.