pathinfo
The termination status, as pointed out in another note, is not the same as the exit status from the process. However, something like "pclose($fp)/256" is not the correct way to extract the exit status, since this uses system- and version-specific knowledge of where in the termination status the exit status is stored. (Also, the process may not even have exited normally, so it may not have an exit status at all.)
Instead, the functions pcntl_wifexited() and pcntl_wexitstatus() should be used. They are wrappers for the C macros WIFEXITED() and WEXITSTATUS() that are designed for determining whether the process had an exit status and what that status was, respectively.
pclose
(PHP 4, PHP 5)
pclose — Ferme un processus de pointeur de fichier
Description
int pclose
( resource $handle
)
Ferme un processus de pointeur de fichier ouvert avec la fonction popen().
Liste de paramètres
- handle
-
Le pointeur de fichier doit être valide, et avoir été ouvert correctement par popen().
Valeurs de retour
Retourne le statut final du processus exécuté ou -1 en cas d'echec.
Exemples
Exemple #1 Exemple avec pclose()
<?php
$handle = popen('/bin/ls', 'r');
pclose($handle);
?>
Notes
Note: Unix seulement:
proc_close() est implémenté en interne en utilisant l'appel système waitpid(3). Pour obtenir le code de statut réel de sortie, la fonction pcntl_wexitstatus() devrait être utilisée.
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User Contributed Notes
pclose
Mike
06-Apr-2008 11:55
chad 0x40 herballure 0x2e com
04-Sep-2007 01:16
Warning: If you're reading a command with infinite output, such as 'vmstat 2', pclose will cause the script to hang. This is because pclose waits for the command to exit, in order to return the exit status. If the process never exits, pclose never returns.
kcross at nssolutions dot com
16-Jul-2003 02:08
Somewhere between 4.1.1 and 4.2.3, the return value from pclose changed.
The exit status used to be in the second byte, so that the status would be (pclose($fp)/256).
It is now in the low-order byte, so the status is just pclose($fp).
Be careful.
vdweij at mailsurf dot com
12-Mar-2003 07:18
As I understand pclose will return 0 (on every platform) in case popen could not execute the specified command.
Since popen only returns the status wether it was able to send a command and not wether it was succesfully executed. Only the returned value of pclose can be used to check wether a command could be executed.
roel at bouwman dot net
07-Oct-1999 10:23
The return value of pclose() is not the exit status of the program, but a value as returned by waitpid() of wait4().
To obtain the exit status:
$ret=(pclose($f)>>8)&0xFF;