How do I write a PHP script that continues running, even after flushing out some text and ending the HTTP request? Is this possible?
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See the answer from PHP Background Processesdrfloob– drfloob2009-09-15 16:57:54 +00:00Commented Sep 15, 2009 at 16:57
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2 Answers
To run PHP app forever or until php terminates
ignore_user_abort(true);
set_time_limit(0);
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Raj
Seems unsafe if the page is requested frequently, the server could have large number of processes that are doing nothing.
You might be interested by the ignore_user_abort configuration directive, and/or the ignore_user_abort function :
Sets whether a client disconnect should cause a script to be aborted.
Using this, you could :
- generate the part of the page that has to be sent to the browser
- flush the output, with
flushand/orob_flush - call
ignore_user_abort(either now or before) - do some more work
The user's browser will probably still indicate "waiting" or "loading", but the content of the page will be loaded and displayed -- and even if the user presses "stop", your script should continue its execution.
For more informations, there is an example on the manual's page of that function -- and you can take a look at this article : How to Use ignore_user_abort() to Do Processing Out of Band
Of course, while this can be used for some light process (like "cleaning up" stuff at the end of a page, while displaying it as fast as possible to the user), you'll still be limited by max_execution_time and the like.
So, this is not a solution that should be used for long/heavy calculations.
