pcntl_exec

(PHP 4 >= 4.2.0, PHP 5)

pcntl_exec — 現在のプロセス空間で指定したプログラムを実行する

説明

void pcntl_exec ( string $path [, array $args [, array $envs ]] )

指定した引数でプログラムを実行します。

パラメータ

path: path は、バイナリ実行ファイルへのパスか、あるいは有効な実行ファイルを指す shebang (例: #!/usr/local/bin/perl) が一行目に存在するスクリプトへのパスである必要があります。詳細な情報については、システムの man ページで execve(2) を参照ください。
args: args は、プログラムに渡す引数文字列の配列です。
envs: envs は、プログラムに渡す環境変数の配列です。この配列は name => value のような形式で、key が環境変数名・value がその値となります。

返り値

エラー時に FALSE を返し、成功時には何も返しません。

pcntl_fork

pcntl_alarm

Last updated: Fri, 18 Jul 2008

add a note User Contributed Notes
pcntl_exec

fahadsadah at gmail dot com dot please dot remove dot this
28-Jun-2008 07:44


Just a note regarding what rbemrose at vgmusic dot com said:

Once the executed process ends, control returns to the webserver process.

rbemrose at vgmusic dot com
06-Feb-2008 02:44


As a side note, if I'm reading the comments below correctly, you should not run this if you're using a PHP webserver module, as it will replace the webserver's process with whatever process you're telling it to run.

agodong at verizon dot net
07-Dec-2006 10:47


Some people might find it useful to run other program using the same process as a different user. This is very usefull if the script is running under root. Here is a simple code to achieve that under *nix PHP CLI:



#!/usr/bin/php -q

<?php

//Enter run-as user below (argument needed to be passed when the script is called), otherwise it will run as the caller user process.



$username = $_SERVER['argv'][1];



$user = posix_getpwnam($username);

posix_setuid($user['uid']);

posix_setgid($user['gid']);

pcntl_exec('/path/to/cmd');

?>



I use this as a part of socket program so that a program can be run under different user from remote location.

eric kilfoil
24-Oct-2006 10:01


The pcntl_exec() function works exactly like the standard (unix-style) exec() function.  It differs from the regular PHP exec() function in that the process calling the pcntl_exec() is replaced with the process that gets called.  This is the ideal method for creating children.  In a simple example (that does no error checking):



switch (pcntl_fork()) {

  case 0:

    $cmd = "/path/to/command";

    $args = array("arg1", "arg2");

    pcntl_exec($cmd, $args);

    // the child will only reach this point on exec failure,

    // because execution shifts to the pcntl_exec()ed command

    exit(0);

  default:

    break;

}



// parent continues

echo "I am the parent";



--



since this is not being executed through a shell, you must provide the exact path from the filesystem root.  Look at the execve() man page for more information.

michael dot ferre at mobileway dot com
20-Nov-2002 03:28


//To complete my last note

//If you use some object in your php code 

//You will have some problem if you do a exit after include the

//child scripts

//You must use posix_kill() like that :



$CHILD_PID = pcntl_fork();

if($CHILD_PID == 0)

{    

  include ($script_path);

  posix_kill(getmypid(),9);

}



//This code is very simple it can be ameliorate ;)

michael dot ferre at mobileway dot com
19-Nov-2002 04:19


//If you are in php version between 4.1 and 4.2

//When you use pcntl_fork and after you want use

//pcntl_exec, you can because pcntl_exec isn't used before

//php 4.2 so let me show a solution :



$CHILD_PID = pcntl_fork();

if($CHILD_PID == 0)

{    

   include ($script_path);

   exit;

}



//$script_path is the  *.php page which you want lauch like

// a child .



//I don't know why php coder hadn't add  pcntl_exec in the

//same time that other function



//Micha�l F. php developer .

add a note

pcntl_fork

pcntl_alarm

Last updated: Fri, 18 Jul 2008