ignore_user_abort

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

ignore_user_abort — 设置客户端断开连接时是否中断脚本的执行

说明

ignore_user_abort(?bool $enable = null): int

设置客户端断开连接时是否中断脚本的执行

PHP 以命令行脚本执行时，当脚本终端结束，脚本不会被立即中止，除非设置 enable为 true，否则脚本输出任意字符时会被中止。

参数

enable: 如果设置了该值且不为 null，函数会设置 ignore_user_abort ini 为 enable。否则，函数不会改变设置，仅会返回之前的设置。

返回值

以整型返回之前的设置

更新日志

版本	说明
8.0.0	`enable` 现在允许为 null。

示例

示例 #1 ignore_user_abort()例子

<?php
/ 忽略用户中止并允许脚本
/ 永远运行
ignore_user_abort(true);
set_time_limit(0);

echo 'Testing connection handling in PHP';

/ Run a pointless loop that sometime 
/ hopefully will make us click away from 
/ page or click the "Stop" button.
while(1)
{
    / 连接失败？
    if(connection_status() != CONNECTION_NORMAL)
    {
        break;
    }

    / 睡眠 10 秒
    sleep(10);
}

/ If this is reached, then the 'break' 
/ was triggered from inside the while loop

/ So here we can log, or perform any other tasks
/ we need without actually being dependent on the 
/ browser.
?>

注释

在PHP尝试发送信息到客户端之前，不会检测到用户是否已中断连接。仅使用 echo 语句不能确保信息已发送，参见 flush() 函数。

参见

connection_aborted() - 检查客户端是否已经断开
connection_status() - 返回连接的状态位
Connection Handling 关于PHP连接处理的完整描述。

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用户贡献的备注 4 notes

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spiritual-coder at spiritual-coder dot com ¶

18 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):



<?php

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);

?>

down

lukas dot starecek at centrum dot cz ¶

15 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:

<?php

set_time_limit(2);
sleep(4);
echo 'hi!';
sleep(4);
echo 'bye bye!';

?>

It means, that if the loop most of the time will be at sleep (and in this case it probably be), then this script may be active for months or years even if you set time limit to one day.

down

Anonymous ¶

15 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.

down

Micke ¶

10 years ago

It seems that this function does not work for IIS servers.

A detailed description can be found on the PHP Bug Tracking System:
https://bugs.php.net/bug.php?id=60586#1378935714