posix_getppid

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

posix_getppid — Return the parent process identifier

说明

posix_getppid(): int

Return the process identifier of the parent process of the current process.

参数

此函数没有参数。

返回值

Returns the identifier, as an int.

范例

示例 #1 Example use of posix_getppid()


<?php
echo posix_getppid(); //8259
?>

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User Contributed Notes 4 notes

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mail at spacerat dot net ¶

4 years ago


answering to http://php.net/manual/en/function.posix-getppid.php#120088

if you're using proc_open and you want to get the pid of the calling php-process, use proc open with usage "exec php $scriptname". In that case, you can get the real parent-id, because php doesn't start a new shell.

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divinity76 at gmail dot com ¶

5 years ago


WARNING, when using proc_open, your child will NOT get the parent php process's PID by using posix_getppid() , it will actually get the pid of a shell ( /bin/sh ? ) started by php, which in turn starts the child.  i don't currently have a good workaround for this, but i'm working around it by having the parent write it's pid to a file and having the chidren read the file

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Avital Yachin ¶

4 years ago


posix_getppid will not work on Windows.
Here's an alternative:

<?php
if(strncasecmp(PHP_OS, "win", 3) == 0) {
   $pid = getmypid();  // child process ID
   $parent_pid = shell_exec("wmic process where (processid=$pid) get parentprocessid");
   $parent_pid = explode("\n", $parent_pid);
   $parent_pid = intval($parent_pid[1]);

   echo "Child: $pid  Parent: $parent_pid\n";           
}
?>

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divinity76 at gmail dot com ¶

5 years ago


when using proc_open, the child's ppid is NOT your php script, but rather a shell started by proc_open's pid. to get your pid, your proc_open child needs to get the parent's parent's (aka grandparent's) pid. here's a way to do that in PHP on linux: 

function posix_getpppid(): int {
    return ( int ) (explode ( " ", file_get_contents ( "/proc/" . posix_getppid () . "/stat" ) ) [3]);
}

(thanks to TML @ irc.freenode.net/##PHP for the technique)

(i said most of this in a previous comment, but i didn't have a good solution for it. now i have. if someone with the privileges read this, can you delete this notice and my previous comment please?)

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官方地址：https://www.php.net/manual/en/function.posix-getppid.php

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posix_getppid

说明

参数

返回值

范例

User Contributed Notes 4 notes