popen
(PHP 4, PHP 5)
popen — Opens process file pointer
Descrierea
Opens a pipe to a process executed by forking the command given by command.
Parametri
- command
-
The command
- mode
-
The mode
Valorile întroarse
Returns a file pointer identical to that returned by fopen(), except that it is unidirectional (may only be used for reading or writing) and must be closed with pclose(). This pointer may be used with fgets(), fgetss(), and fwrite().
If an error occurs, returns FALSE.
Exemple
Example#1 popen() example
<?php
$handle = popen("/bin/ls", "r");
?>
If the command to be executed could not be found, a valid resource is returned. This may seem odd, but makes sense; it allows you to access any error message returned by the shell:
Example#2 popen() example
<?php
error_reporting(E_ALL);
/* Add redirection so we can get stderr. */
$handle = popen('/path/to/spooge 2>&1', 'r');
echo "'$handle'; " . gettype($handle) . "\n";
$read = fread($handle, 2096);
echo $read;
pclose($handle);
?>
Note
Notă: If you're looking for bi-directional support (two-way), use proc_open().
Notă: Când este activat modul securizat, puteţi executa fişierele executabile aflate în safe_mode_exec_dir. Din motive practice, în prezent nu se permite de a avea componente .. în calea către executabil.
Când este activat modul securizat, linia de comandă este prelucrată cu escapeshellcmd(). De aceea, echo y | echo x devine echo y \| echo x.