Re: RE: [PHP] flushing AJAX scripts

My page submits the AJAX request to complete a report that takes some time, and upon completion stores results in a database. A second AJAX request polls every 5 seconds and queries the database if the report is ready. This hopefully will get around any timeout problems I am having with a long running request, and seems to be working. It looks like I can accept the default behavior for now. I don't depend on getting a response from the original request, but is there a point where the AJAX response script will be stopped either by Apache or PHP before it can insert into the database? Jim Andrea Giammarchi wrote:

Some browser would like to receive at list N characters (bytes) even if you force the flush, before the browser will show those characters. In any case, the Ajax request will not be completed until its readyState will be 4, which means the page execution on the server has finished (released, php has gone, flush or not flush) For a task like this one you have few options: 1 - launch new thread if your host is able to do it 2 - use a Comet like response (for php I wrote Phico some while ago) In any case, I hope this stressful operation cannot be performed from thousand of users or you can say bye bye to the service. Alternatives: 1 - optimize your database 2 - delegate the job once a time rather than every click (cronjob) 3 - if the bottleneck is PHP, create an extension in C to perform the same task Hope this help. Regards P.S. Internet Explorer a part, you can read the responseText on readystate 3 which will be called different time (most likely for each flush). If IE is not your target, you could consider this opportunity to read the sent stream so far.

Date: Fri, 27 Mar 2009 08:49:35 +1100 From: dmagick@gmail.com To: jbw2003@earthlink.net CC: php-general@lists.php.net Subject: Re: [PHP] flushing AJAX scripts jim white wrote:

    
I am using jQuery AJAX request to run a script that can take several minutes to create a report. I want to start the script and immediately echo a response to close the connection and then let the script complete a report which I can get later. I have tried several thing such as

ob_start(); echo json_encode(array("time"=>$now, "message"=>"Report has started running!")); ob_end_flush();

Try something like this echo "something"; flush(); without the ob* stuff. -- Postgresql & php tutorials http://www.designmagick.com/ -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php

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