Hướng dẫn ignore_user_abort in php

(PHP 4, PHP 5, PHP 7, PHP 8)

ignore_user_abort — Set whether a client disconnect should abort script execution

Description

ignore_user_abort(?bool $enable = null): int

When running PHP as a command line script, and the script's tty goes away without the script being terminated then the script will die the next time it tries to write anything, unless enable is set to true

Parameters

If set and not null, this function will set the ignore_user_abort ini setting to the given enable. Otherwise, this function will only return the previous setting without changing it.

Return Values

Returns the previous setting, as an integer.

Changelog

Examples

Example #1 A ignore_user_abort() example

// Ignore user aborts and allow the script
// to run forever
ignore_user_abort(true);
set_time_limit(0);

echo

Notes

PHP will not detect that the user has aborted the connection until an attempt is made to send information to the client. Simply using an echo statement does not guarantee that information is sent, see flush().

See Also

• connection_aborted() - Check whether client disconnected
• connection_status() - Returns connection status bitfield
• Connection Handling for a complete description of connection handling in PHP.

spiritual-coder at spiritual-coder dot com ¶

16 years ago

If you want to simulate a crontask you must call this script once and it will keep running forever (during server uptime) in the background while "doing something" every specified seconds (= $interval):

ignore_user_abort(1); // run script in background
set_time_limit(0); // run script forever
$interval=60*15; // do every 15 minutes...
do{
   // add the script that has to be ran every 15 minutes here
   // ...
   sleep($interval); // wait 15 minutes
}while(true);
?>

lukas dot starecek at centrum dot cz ¶

13 years ago

Comment from Anonymous is not 100% valid. Time from sleep function is not counted to execution time because sleep delays program execution (see http://www.php.net/manual/en/function.sleep.php and comments). We tested it and it's true. Try this:

set_time_limit

Anonymous ¶

13 years ago

use the spiritual-coder's code below with exreme caution and do not use it unless you are an advanced user.

first of all, such a code with no bypass point can cause infinite loops and ghost threads in server. there must be a trick to break out the loop.

i.e. you can use  if (file_exists(dirname(__FILE__)."stop.txt")) break; in the loop so if you create "stop.txt", she script will stop execution.

also if you use set_time_limit(86400); instead of set_time_limit(0); your script will stop after one day.

Charlie Brown ¶

7 years ago

If running a long process and the browser often close the connection, then use this function.

plamen at pulsator dot com ¶

21 years ago

The script should output something to the browser in order to abort. If there is no output the script keeps on running.