Issue
I'm attempting to do an AJAX call (via JQuery) that will initiate a fairly long process. I'd like the script to simply send a response indicating that the process has started, but JQuery won't return the response until the PHP script is done running.
I've tried this with a "close" header (below), and also with output buffering; neither seems to work. Any guesses? or is this something I need to do in JQuery?
<?php
echo( "We'll email you as soon as this is done." );
header( "Connection: Close" );
// do some stuff that will take a while
mail( 'dude@thatplace.com', "okay I'm done", 'Yup, all done.' );
?>
Solution
The following PHP manual page (incl. user-notes) suggests multiple instructions on how to close the TCP connection to the browser without ending the PHP script:
Supposedly it requires a bit more than sending a close header.
OP then confirms: yup, this did the trick: pointing to user-note #71172 (Nov 2006) copied here:
Closing the users browser connection whilst keeping your php script running has been an issue since [PHP] 4.1, when the behaviour of
register_shutdown_function()
was modified so that it would not automatically close the users connection.sts at mail dot xubion dot hu Posted the original solution:
<?php header("Connection: close"); ob_start(); phpinfo(); $size = ob_get_length(); header("Content-Length: $size"); ob_end_flush(); flush(); sleep(13); error_log("do something in the background"); ?>
Which works fine until you substitute
phpinfo()
forecho('text I want user to see');
in which case the headers are never sent!The solution is to explicitly turn off output buffering and clear the buffer prior to sending your header information. Example:
<?php ob_end_clean(); header("Connection: close"); ignore_user_abort(true); // just to be safe ob_start(); echo('Text the user will see'); $size = ob_get_length(); header("Content-Length: $size"); ob_end_flush(); // Strange behaviour, will not work flush(); // Unless both are called ! // Do processing here sleep(30); echo('Text user will never see'); ?>
Just spent 3 hours trying to figure this one out, hope it helps someone :)
Tested in:
- IE 7.5730.11
- Mozilla Firefox 1.81
Later on in July 2010 in a related answer Arctic Fire then linked two further user-notes that were-follow-ups to the one above:
Answered By - Joeri Sebrechts Answer Checked By - Willingham (PHPFixing Volunteer)
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