search
HomeBackend DevelopmentPHP TutorialPHP extension implements daemon process_PHP tutorial

PHP extension program implements daemon process

Generally, server programs run in the background of the system, which is very different from ordinary interactive command line programs. There is a function daemon in glibc. Calling this function can cause the current process to leave the terminal and become a daemon process. For details, see man daemon. There is currently no such function in PHP. Of course, if you are interested, you can write a PHP extension function to implement it.

There are two ways to implement daemonization of PHP command line programs:

1. Use nohup

Copy the code The code is as follows:


nohup php myprog.php > log.txt &

Daemonization is implemented here.

Execute php myprog.php alone. When ctrl c is pressed, program execution will be interrupted and the current process and child processes will be killed.

php myprog.php &, although the execution program is also run in the background, it actually relies on the terminal. When the user exits the terminal, the process will be killed.

2. Use PHP code to implement

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

function daemonize()

{

$pid = pcntl_fork();

if ($pid == -1)

{

die("fork(1) failed!n");

}

elseif ($pid > 0)

{

//让由用户启动的进程退出

exit(0);

}

 

//建立一个有别于终端的新session以脱离终端

posix_setsid();

 

$pid = pcntl_fork();

if ($pid == -1)

{

die("fork(2) failed!n");

}

elseif ($pid > 0)

{

//父进程退出, 剩下子进程成为最终的独立进程

exit(0);

}

}

 

daemonize();

sleep(1000);

1 2

3

4 5

67 8 9 10 11 12
13
14
15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
function daemonize() { $pid = pcntl_fork(); if ($pid == -1) { die("fork(1) failed!n"); } elseif ($pid > 0) { //Let the process started by the user exit exit(0); } //Create a new session different from the terminal to break away from the terminal posix_setsid(); $pid = pcntl_fork(); if ($pid == -1) { die("fork(2) failed!n"); } elseif ($pid > 0) { //The parent process exits, and the remaining child process becomes the final independent process exit(0); } } daemonize(); sleep(1000);
Use the above code to implement daemonization. When your PHP program needs to run in the background, you only need to call the encapsulated function daemonize() once. Note: Redirection of standard input and output is not implemented here. http://www.bkjia.com/PHPjc/985143.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/985143.htmlTechArticlePHP extension program implements daemon process. Generally, server programs run in the background of the system, which is different from ordinary interactive command lines. The procedures make a big difference. There is a function daemon in glibc. Call this...
Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
php怎么把负数转为正整数php怎么把负数转为正整数Apr 19, 2022 pm 08:59 PM

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

php怎么实现几秒后执行一个函数php怎么实现几秒后执行一个函数Apr 24, 2022 pm 01:12 PM

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php怎么除以100保留两位小数php怎么除以100保留两位小数Apr 22, 2022 pm 06:23 PM

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

php字符串有没有下标php字符串有没有下标Apr 24, 2022 am 11:49 AM

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

php怎么根据年月日判断是一年的第几天php怎么根据年月日判断是一年的第几天Apr 22, 2022 pm 05:02 PM

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

php怎么读取字符串后几个字符php怎么读取字符串后几个字符Apr 22, 2022 pm 08:31 PM

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。

php怎么替换nbsp空格符php怎么替换nbsp空格符Apr 24, 2022 pm 02:55 PM

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\&nbsp\;||\xc2\xa0)/","其他字符",$str)”语句。

php怎么判断有没有小数点php怎么判断有没有小数点Apr 20, 2022 pm 08:12 PM

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Tools

Safe Exam Browser

Safe Exam Browser

Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

MantisBT

MantisBT

Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

ZendStudio 13.5.1 Mac

ZendStudio 13.5.1 Mac

Powerful PHP integrated development environment