How can I execute remaining php code after calling "exit"?

Question

How can a client send a request to a server just to trigger an execution, where the server immediately sends a response then executes the requested code? Similar to this:

echo 'the execution is starting';
exit;
execution_function(); // <--- is it possible to this function being executed after exit

I want the response to be immediate so the client can do other things while the server executes the request.

you cann not do it. you have to write the function before exit; or delete the exit; — Tufan Barış Yıldırım, Jul 15 '12 at 04:56
http://stackoverflow.com/questions/10403521/how-do-i-implement-this-scenario-using-php — Musa, Jul 15 '12 at 04:58
Can't you just call the function **before** the `exit`? The main point of calling `exit`, as the name implies, is to end the current script. Even if there is an workaround, it'd one of those things you shouldn't do imo. — Fabrício Matté, Jul 15 '12 at 04:59
See: http://stackoverflow.com/questions/3833013/continue-php-execution-after-sending-http-response — Jason Bury, Jul 15 '12 at 05:00
Fabricio Matte - then how to response the client before exit? — stackunderflow, Jul 15 '12 at 05:46
@Jerinho: Please do not play around with the rollback function. The edit to your question was perfectly fine. — ThiefMaster, Jul 15 '12 at 12:04
@ThiefMaster - the question (modified one) is logically fail to complete the information i included. please review it if u mind — stackunderflow, Jul 15 '12 at 12:10
The question is being modified by someone. click here for more http://stackoverflow.com/questions/11491743/how-to-build-php-triggerable-service — stackunderflow, Jul 15 '12 at 12:37

score 12 · Answer 1 · answered Jul 15 '12 at 05:10

12

You can use register_shutdown_function() to set a callback function which will be executed when PHP exits.

answered Jul 15 '12 at 05:10

Michael Hampton

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+1 for correct answer. But bear in mind that this will be triggered by anything that causes the program to stop, including a fatal error. This may or may not be what you want, but it's worth being aware of it. – Spudley Jul 15 '12 at 06:08
1

im sorry. i'd try it.. but register_shutdown_function() is executed before exit and and before response – stackunderflow Jul 15 '12 at 10:43

munna ss · Answer 2 · 2020-07-29T08:42:14.230

3

You can use register_shutdown_function() after exit() , die() , even you can register fatal error to your error register log using this function.Quite handy

edited Jul 29 '20 at 08:42

answered Aug 28 '19 at 22:36

munna ss

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Hebe · Accepted Answer · 2022-10-19T17:33:05.903

1

Thanks to this question I figured out the way to insert and execute code at the end of script. Usefull when you're debugging a website.

function shutdown($var){
    echo '<pre>';
    var_export($var);
    echo '</pre>';
}
// pass get_included_files()
register_shutdown_function('shutdown',get_included_files());
// or something else
register_shutdown_function('shutdown',get_defined_vars());

note: shutdown is executed after script execution finishes or exit() is called.

edited Oct 19 '22 at 17:33

answered Oct 19 '22 at 17:26

Hebe

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with ob_start() you can also catch the whole script output generated until the shutdown and log that. It would be useful for logging requests and responses given by your API (it's a standard practice). Also, tools like Sentry doesn't log the whole output. – Marco Marsala Nov 24 '22 at 08:17

score 0 · Answer 4 · answered Jul 15 '12 at 05:17

0

I don't think that can be done.

Usually what I do is call an exec() to another external script in another PHP file, with the " > /dev/null &" at the end of the command and exit() just after.

So that the script that called the exec() will not be running when the called script is running.

answered Jul 15 '12 at 05:17

Salocin.TEN

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That works, but it gets a little sticky if you're dealing with thousands of requests. – Tim Post Jul 15 '12 at 06:01
Hi Jerinho, so it does not work? They worked in my case where the PHP are CLI script run via cron. Yeah thousands of requests demands some skill at finding out which ones are running first. – Salocin.TEN Jul 16 '12 at 01:48

score -4 · Answer 5 · answered Jul 15 '12 at 05:01

It's not possible, and the reason for that is that when you call the exit function, PHP stops processing anything after that. It's normal usage is for your script to stop running if it detects an error for zero possibility of it reaching the success conditional actions.

If you want your script to continue running and doing stuff, place the stuff you want it to do before the exit function.

How can I execute remaining php code after calling "exit"?

5 Answers5