pcntl_alarm
Just a note regarding what rbemrose at vgmusic dot com said:
Once the executed process ends, control returns to the webserver process.
pcntl_exec
(PHP 4 >= 4.2.0, PHP 5)
pcntl_exec — Führt ein angegebenes Programm im aktuellen Prozessraum aus
Beschreibung
void pcntl_exec
( string
$path
[, array $args
[, array $envs
]] )
pcntl_exec() führt das Programm
path mit den Parametern args
aus. path muss der Pfad zur binären ausführbaren
Datei oder einem Skript mit einem gültigen auf eine ausführbare Datei
zeigenden Pfad in der Shebang (zum Beispiel #!/usr/local/bin/perl) als
erste Zeile sein. Suchen Sie in der execve(2) man Seite Ihres Systems nach
weiteren Informationen.
args ist ein Array von Parameterstrings, die dem
Programm übergeben werden.
envs ist ein Array von Strings, die dem Programm
als Umgebungsvariablen übergeben werden. Das Array ist im Format Name
=> Wert, wobei der Schlüssel der Name der Umgebungsvariable und der Wert
der Inhalt dieser Variable ist.
pcntl_exec() gibt bei Fehlern FALSE zurück und kehrt
bei Erfolg nicht mehr zurück.
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User Contributed Notes
pcntl_exec - [8 notes]
fahadsadah at gmail dot com dot please dot remove dot this ¶
4 years ago
rbemrose at vgmusic dot com ¶
5 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.
agodong at verizon dot net ¶
6 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.
michael dot ferre at mobileway dot com ¶
10 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 ($script_path);
posix_kill(getmypid(),9);
}
//This code is very simple it can be ameliorate ;)
maxime at diametrick dot com ¶
1 month ago
An alternative for Windows environment is to use the COM object. With this, you can start child process with Apache, or php.exe as parent process. Very useful for CLI or console PHC-Win applications.
if(!function_exists('pcntl_exec')){
function pcntl_exec($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!
eric kilfoil ¶
6 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.
trevorpearce at gmail dot com ¶
1 year ago
I spent a lot of time trying to figure this powerful option out so I didn't get error 2 or error 8. The documentation says it can execute a binary file and here is a good example that works that I found;
<?php
print "Before\\n";
pcntl_exec("/usr/bin/uptime");
print "After\\n";
?>
However I wanted it to run another php program and after wasting a lot of time I finally got it.
<?php
$tasks2=array('/var/www/example.php');
pcntl_exec("/usr/bin/php",$tasks2);
?>
The php script has to be in an array and you execute the binary php file
I'll be adding this to launching a child and run it seperately using this function
<?php
function launchchild($programexe,$programvars)
{
//foreach ($tasks as $key => $v){
switch ($pid = pcntl_fork()) {
case -1:
// @fail
die('Fork failed');
break;
case 0:
// @child: Include() misbehaving code here
print "FORK: Child #{$x} \\n";
echo "child after fork:", getmypid(), PHP_EOL;
pcntl_exec($programexe,$programvars);
// generate_fatal_error(); // Undefined function
break;
default:
// @parent
print "FORK: $x Parent\\n";
echo "parent after fork:", getmypid(), PHP_EOL;
// pcntl_waitpid($pid, $status);
break;
}
print "Done! :^)\\n\\n";
}
?>
michael dot ferre at mobileway dot com ¶
10 years ago
//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
//Michaël F. php developer .