system

(PHP 4, PHP 5, PHP 7)

system Exécute un programme externe et affiche le résultat

Description

string system ( string $command [, int &$return_var ] )

system() est la version PHP de la fonction C qui exécute la commande command et retourne le résultat.

L'appel à la fonction system() tente également d'actualiser le buffer de sortie du serveur web après chaque ligne de sortie si PHP fonctionne en tant que module serveur.

Si vous devez exécuter une commande et récupérer tout le résultat sans aucune intervention, utilisez la fonction passthru().

Liste de paramètres

command

La commande à exécuter.

return_var

Si l'argument return_var est présent, alors le statut retourné de l'exécution de la commande sera écrit dans cette variable.

Valeurs de retour

Retourne la dernière ligne de la sortie de la commande en cas de succès, et FALSE si une erreur survient.

Exemples

Exemple #1 Exemple avec system()

<?php
echo '<pre>';

 
// Affiche le résultat de la commande "ls" et retourne
 // la dernière lignes dans $last_line. Stocke la valeur retournée
 // par la commande shelle dans $retval.
 
$last_line system('ls'$retval);

 
// Affichage d'autres informations
 
echo '
</pre>
<hr />La dernière ligne en sortie de la commande : ' 
$last_line '
<hr />Valeur retournée : ' 
$retval;
?>

Notes

Avertissement

Si vous allez passer des données provenant de l'utilisateur à cette fonction, vous devez utiliser escapeshellarg() ou escapeshellcmd() pour être sûr qu'ils n'endommagent pas le système en exécutant des commandes arbitraires.

Note:

Si vous démarrez un programme en utilisant cette fonction et que vous voulez le laisser tourner en arrière plan, vous devez vous assurer que la sortie du programme est redirigée vers un fichier, ou un autre flux de sortie, sinon PHP attendra jusqu'à la fin de l'exécution du programme.

Note: Lorsque le safe mode est activé, vous pouvez uniquement exécuter des programmes qui se situent dans le dossier défini par safe_mode_exec_dir. Pour des raisons pratiques, il n'est actuellement pas permis d''avoir le composant .. dans le chemin de l'exécutable.

Avertissement

Lorsque le safe mode est activé, la chaîne de commande est échappée avec la fonction escapeshellcmd(). Par exemple, echo y | echo x devient echo y \| echo x.

Voir aussi

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User Contributed Notes 53 notes

up
53
no at mail dot com
5 years ago
This is for WINDOWS users. I am running apache and I have been trying for hours now to capture the output of a command.

I'd tried everything that is written here and then continued searching online with no luck at all. The output of the command was never captured. All I got was an empty array.

Finally, I found a comment in a blog by a certain amazing guy that solved my problems.

Adding the string ' 2>&1' to the command name finally returned the output!! This works in exec() as well as system() in PHP since it uses stream redirection to redirect the output to the correct place!

system("yourCommandName 2>&1",$output) ;
up
4
dan at thecsl dot org
11 years ago
You probably want to check your system calls for errors. The convention is to return 0  for "no error" which is the same as FALSE which can be confusing. You need to do something like:

<?php
  $cmd
= "/usr/bin/pngtopnm $png_file > $pnm_file";
 
system($cmd,$return_value);
  (
$return_value == 0) or die("returned an error: $cmd");
?>
up
2
matt-php at cdsportland dot com
11 years ago
If using Windows with IIS and you're having problems with the system() and related commands, I found the easiest way to solve it was to modify the Authentication Method for the file (or directory) that uses the call and change the anonymous access user from the default (IUSR_IMAGE) to a user with enough permissions to execute the commands in the system call.  This way, there is no need to give execute permissions to IUSR_IMAGE on cmd.exe (which opens up a security risk system-wide) or copy cmd.exe into your php directory (per the suggestions of others).  Hope this helps someone!
up
6
d dot kraft at szo dot de
14 years ago
For PHP running inside a Webserver:

When calling a process via
system("your_process &");
to make it running in background, note that this process is killed when the webserver is restarted.
up
3
morris_hirsch at hotmail dot com
14 years ago
another reason to use shell_exec instead of system is when the result is multiple lines such as grep or ls

<?php

// this correctly sets answer string to all lines found
//$answer = shell_exec ("grep 'set of color names' *.php ");
//echo "answer = $answer";

// this passes all lines to output (they  show on page)
// and sets answer string to the final line
$sys = system ("grep 'set of color names' *.php ");
echo
"sys =(($sys))";

?>

here is view/source resulting from system call

setprefs.php:// The standard set of color names is:
setprefs.php:// Most browsers accept a wider set of color names
silly.php:  //$answer = shell_exec ("grep 'set of color names' *.php ");
silly.php: $sys = system ("grep 'set of color names' *.php ");
sys =((silly.php: $sys = system ("grep 'set of color names' *.php ");))

and here is view source from using shell_exec instead

answer = setprefs.php:// The standard set of color names is:
setprefs.php:// Most browsers accept a wider set of color names
silly.php:  $answer = shell_exec ("grep 'set of color names' *.php ");
silly.php:// $sys = system ("grep 'set of color names' *.php ");
up
7
vlad dot sharanhovich at gmail dot com
9 years ago
The double quote problem on Windows platform discussed earlier here in comments still present in PHP 5.2.5. You can't execute system($command) if $command contains more than 2 " chars. system('"echo" A'); works, while system('"echo" "A"'); does not. Search comment, that was a solution posted to overhaul this issue via temporary .bat file.
up
2
eric_REMOVE at movementmovement_REMOVE dot com
13 years ago
It's important to note that if you are running a series of system() commands in a loop, you need to include the second argument in order for them to run synchonously.

ie)

// this will execute process.php asynchronously; not waiting for completion before executing the next one.
$array = array('apple', 'banana', 'pear');
foreach($array as $i)
{
system("php process.php \"fruit=$i\"");
}

// this will execute process.php 3 times, waiting for the prior command to complete before starting a new one
$array = array('apple', 'banana', 'pear');
foreach($array as $i)
{
system("php process.php \"fruit=$i\"", $status);
}
up
5
mortoray at ecircle-ag dot com
13 years ago
Do not use "system" if you use the "php.ini" option:
    zlib.output_compression = On

Doing so will result in the browser receiving garbage (I'm guessing the headers/buffers get confused).

Use passthru in this case, it appears to work as intended.
up
1
timgolding_10 at hotmail dot com
10 years ago
An example of using the system to call the file command on a linux server. This script detects whether a user posted file is a jpeg, gif or png

<?PHP

$accepted_types
=array("JPEG" , "GIF", "PNG");

   
// The temporary filename of the file in which the uploaded file was stored on the server.
if(!empty($_FILES["uploadedfile"]))
  {
   
$uploaddir = $_SERVER['DOCUMENT_ROOT']."/images/";
   
$uploaddir.=basename( $_FILES['uploadedfile']['name']);
  
//verfiy file using linux FILE command
$last_line = system('file '.escapeshellarg($_FILES['uploadedfile']['tmp_name']), $retval);

//get the file extension returned through magic database
$splitvals=explode(' image data' $last_line);
$vals=explode(':', $splitvals[0]);
$vals[1]=str_replace(' ','', $vals[1]);

if (
in_array($vals[1], $accepted_types))
{
    echo
$vals[1].' was accepted <br /DD0000">'<pre&gclass="keyword">;
    a">
you are iass=_existpan class="default">$vals($uploaddir))
))
))
))
))
);

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))
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);
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))
))
))]))
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    ed">(
$_FILES['uploadedfile']['DOCUMENT_ROOT'].' was accepted <br /DD0000">'<pre&br />    ed">(?>
401iv class="note" id="35842">
up 401iv > <401ivlass="tally" id="V76561" title="60% like this..."> 1 a href="#76561" class="name"> an314rong clain">
10 years ago
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2142iv class="note" id="42567">
up 2142iv > 2142ivon.syste5y" id="V108713" title="66% like this..."> 2 a href="#76561" class="name"> 5 years ago
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5562iv class="note" id="42567">
up 5562iv > 5562ivon.syste57y" id="V66795" title="60% like this..."> 1 a href="#76561" class="name"> timgolding_10 at hotmail dot com5 years ago
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783iv class="note" id="66795">
up 783iv > <783ivon.syste57y" id="V66795" title="60% like this..."> 1 a href="#76561" class="name"> morris_hirsch at hotmail dot com
13 years ago
="text" id="Hcom35842">

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15159v class="note" id="76561">
up 5159v > <5159von.syste5ly" id="V42567" title="66% like this..."> 2 a href="#76561" class="name"> no at mail dot com5 years ago
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40110v class="note" id="40454">
up 110v >
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2 a href="#76561" class="name"> mortoray at ecircle-ag dot com
13 years ago
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4058iv class="note" id="76561">
up 58iv > 1 a href="#76561" class="name"> mortoray at ecircle-ag dot com
13 years ago
="text" id="Hcom42567">
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14 years ago
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28519v class="note" id="76561">
up 28519v > 28519von.syste54y" id="V60836" title="60% like this..."> 1 a href="#76561" class="name"> mortoray at ecircle-ag dot com
14 years ago
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13 years ago
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13 years ago
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7089v class="note" id="76561">
up 7089v > <7089von.syste50y" id="V40454" title=060% like this..."> 1 a href="#76561" class="name"> timgolding_10 at hotmail dot com
14 years ago
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up 29iv > 1 a href="#76561" class="name">
14 years ago
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up 361iv > <361ivon.syste50y" id="V40454" title=060% like this..."> 1 a href="#76561" class="name">
14 years ago
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2353iv class="note" id="35842">
up 2353iv > 2353ivon.syste50y" id="V40454" title=060% like this..."> 1 a href="#76561" class="name"> mortoray at ecircle-ag dot com14 years ago
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19230v class="note" id="40454">
up 9230v > <9230von.syste50y" id="V40454" title=060% like this..."> 1 a href="#76561" class="name"> 14 years ago
="text" id="Hcom35842">
6978v class="note" id="40454">
up 6978v > 6978von.syste50y" id="V40454" title=060% like this..."> 1 a href="#76561" class="name"> imgonetng_10 at hotmail dot com14 years ago
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83930v class="note" id="40454">
up 83930v > 83930von.syste47y" id="V40454" title=-"60% like this..."> 1 a href="#76561" class="name"> moros="dsch at hotmail dot com13 years ago
="text" id="Hcom35842">
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58423v class="note" id="76561">
up 58423v > 58423von.syste46y" id="V40454" title=-"60% like this..."> 1 a href="#76561" class="name"> <> {5 years ago
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112910v class="note" id="40454">
up 12910v > <12910von.syste4ly" id="V40454" title=-"66% like this..."> 2 a href="#76561" class="name"> no at mail dot com14 years ago
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2020iv class="note" id="42567">
up 2020iv > 2020ivon.syste44y" id="V60836" title=-"60% like this..."> 1 a href="#76561" class="name"> imgonetng_10 at hotmail dot com14 years ago
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5219iv class="note" id="66795">
up 5219iv > 5219ivon.syste42y" id="V40454" title=-"60% like this..."> 1 a href="#76561" class="name"> imgonetng_10 at hotmail dot com5 years ago
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2006iv class="note" id="35842">
up 2006iv > 2006ivon.syste40y" id="V40454" title=-"60% like this..."> 1 a href="#76561" class="name"> timgol/>14 years ago
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up 9066iv > 9066ivon.syste36y" id="V40454" title=-360% like this..."> 1 a href="#76561" class="name"> timgoldiay at ecircle-ag dot com14 years ago
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7771iv class="note" id="66795">
up 7771iv > 7771ivon.syste3ly" id="V40454" title=-"60% like this..."> 1 a href="#76561" class="name"> timgoldiay at ecircle-ag dot com14 years ago
="text" id="Hcom60836">
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74173v class="note" id="76561">
up 74173v > 74173von.syste3ly" id="V40454" title=-"60% like this..."> 1 a href="#76561" class="name"> I'rystomn (whimgoldiay at ecircle-ag dot com14 years ago
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90664v class="note" id="35842">
up 90664v > 90664von.syste3ly" id="V40454" title=-"66% like this..."> 2 a href="#76561" class="name"> timgoldiay at ecircle-ag dot com14 years ago
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52770v class="note" id="40454">
up 52770v > 52770von.syste3ly" id="V40454" title=-"60% like this..."> 1 a href="#76561" class="name"> 5 years ago
="text" id="Hcom35842">
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45961v class="note" id="40454">
up 45961v > 45961von.syste3ly" id="V40454" title=-"66% like this..."> 2 a href="#76561" class="name"> I'poopeeds="uan csch at hotmail dot com5 years ago
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973v class="note" id="76561">
up 973v > 973von.syste3ly" id="V40454" title=-"60% like this..."> 1 a href="#76561" class="name"> <1999-06c14 11:07 title="2008-09-16 02:49">14 years ago
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634iv class="note" id="42567">
up 634iv > 634ivon.syste3ly" id="V40454" title=-"66% like this..."> 2 a href="#76561" class="name"> imgonetng_10 at hotmail dot com14 years ago
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up 80550v > 80550vra; 2 a href="#76561" class="name"> 13 years ago
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up 75883v > 75883vra; 2 a href="#76561" class="name"> 14 years ago
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7373iv class="note" id="42567">
up 7373iv > 7373ivra; 2 a href="#76561" class="name"> timgoldiay at ecircle-ag dot com14 years ago
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