pcntl_exec

(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)

pcntl_exec — Exécute le programme indiqué dans l'espace courant de processus

Description

function pcntl_exec(string $path, array $args = [], array $env_vars = []): false

Exécute le programme indiqué dans l'espace courant de processus.

Liste de paramètres

path

path doit être le chemin vers un binaire exécutable ou un script avec un chemin valide pointant vers un exécutable à la première ligne (par exemple, #!/usr/local/bin/perl). Voir les pages d'aide du système concernant execve(2) pour plus d'informations.

args

args est un tableau d'arguments sous la forme de chaînes de caractères passées au programme.

env_vars

env_vars est un tableau de chaînes de caractères qui sont passées au programme comme variables d'environnement. Le tableau est de la forme nom => valeur, la clé est le nom de la variable d'environnement et la valeur est la valeur de cette variable.

Valeurs de retour

Retourne false en cas d'échec. En cas de succès, la fonction ne retourne pas, car l'image du processus courant est remplacée par le programme exécuté.

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User Contributed Notes 3 notes

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15
agodong at verizon dot net
19 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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10
eric kilfoil
19 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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1
rbemrose at vgmusic dot com
18 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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