posix_getppid()

(PHP 4, PHP 5, PHP 7)

Return the parent process identifier

说明

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

返回值

Returns the identifier, as an integer.

范例

Example use of posix_getppid()

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.

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

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

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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