PHP 7.2.0 Release Candidate 2 Released

pcntl_exec

(PHP 4 >= 4.2.0, PHP 5, PHP 7)

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

bool 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。

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User Contributed Notes 6 notes

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7
agodong at verizon dot net
10 years ago
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.
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0
fahadsadah at gmail dot com dot please dot remove dot this
9 years ago
Just a note regarding what rbemrose at vgmusic dot com said:
Once the executed process ends, control returns to the webserver process.
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0
rbemrose at vgmusic dot com
9 years ago
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.
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0
eric kilfoil
10 years ago
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.
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0
michael dot ferre at mobileway dot com
14 years ago
//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 ;)
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-9
maxime at diametrick dot com
4 years ago
An alternative for Windows environment is to use the COM object. With this, you can start child process with Apache, or php.exe as parent process. Very useful for CLI or console PHC-Win applications.

if(!function_exists('pcntl_exec')){
  function pcntl_exec($path,$args=array()){
    if(is_string($args)) $args = array($args);
    if(count($args)) $path = '"'.$path.'"';
    $shell = new COM('WScript.Shell');
    $shell->run($path.(count($args) ? ' '.implode(' ',$args) : ''),0,true);
  }
}

Very useful too when you want to use ansicon. Instead of make a .bat file with ansicon -p and php .... (somefile).php, in your .php file you can put this on top of your code:

pcntl_exec('ansicon -p');

BINGO!
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