Funktionsreferenz
PHP Manual

Expect Functions

Einführung

This extension allows to interact with processes through PTY. You may consider using the expect:// wrapper with the filesystem functions which provide a simpler and more intuitive interface.

Anforderungen

This module uses the functions of the » expect library. You need libexpect version >= 5.43.0.

Installation

Diese » PECL Erweiterung ist nicht Teil von PHP. Zusätzliche Informationen, wie neue Releases, Downloads Quelldateien, Maintainerinformation und ein CHANGELOG finden Sie hier: » http://pecl.php.net/package/expect.

Für PHP 4 finden Sie die Quellen dieser PECL Erweiterung im ext/ Verzeichnis innerhalb der PHP Quellen oder unter dem PECL Link wie oben angegeben. In order to use these functions you must compile PHP with expect support by using the --with-expect[=DIR] configure option.

Windows users will enable php_expect.dll inside of php.ini in order to use these functions. Für PHP 4 finden Sie die DLL im extensions/ Verzeichnis der PHP Windows Binärdistribution. Sie können die DLL für diese PECL Erweiterung entweder von » PHP Downloads oder von » http://snaps.php.net/ herunterladen.

Laufzeit Konfiguration

Das Verhalten dieser Funktionen wird durch Einstellungen in der php.ini beeinflusst.

In order to configure expect extension, there are configuration options in the configuration file php.ini.

Expect Konfigurationsoptionen
Name Standard Veränderbar Changelog
expect.timeout "10" PHP_INI_ALL  
expect.loguser "1" PHP_INI_ALL  
expect.logfile "" PHP_INI_ALL  
Weitere Details und die Definitionen der PHP_INI_*-Konstanten finden Sie im php.ini Einstellungen.

Hier eine kurze Erklärung der Konfigurationsoptionen:

expect.timeout integer

The timeout period for waiting for the data, when using the expect_expectl() function.

A value of "-1" disables a timeout from occurring.

Hinweis: A value of "0" causes the expect_expectl() function to return immediately.

expect.loguser boolean

Whether expect should send any output from the spawned process to stdout. Since interactive programs typically echo their input, this usually suffices to show both sides of the conversation.

expect.logfile string

Name of the file, where the output from the spawned process will be written. If this file doesn't exist, it will be created.

Hinweis: If this configuration is not empty, the output is written regardless of the value of expect.loguser.

Resource Typen

expect_popen() returns an open PTY stream used by expect_expectl().

Vordefinierte Konstanten

Folgende Konstanten werden von dieser Erweiterung definiert und stehen nur zur Verfügung, wenn die Erweiterung entweder statisch in PHP kompiliert oder dynamisch zur Laufzeit geladen wurde.

EXP_GLOB (integer)
Indicates that the pattern is a glob-style string pattern.
EXP_EXACT (integer)
Indicates that the pattern is an exact string.
EXP_REGEXP (integer)
Indicates that the pattern is a regexp-style string pattern.
EXP_EOF (integer)
Value, returned by expect_expectl(), when EOF is reached.
EXP_TIMEOUT (integer)
Value, returned by expect_expectl() upon timeout of seconds, specified in value of expect.timeout
EXP_FULLBUFFER (integer)
Value, returned by expect_expectl() if no pattern have been matched.

Beispiele

This example connects to the remote host via SSH, and prints the remote uptime.

Example#1 Expect Usage Example

<?php
ini_set 
("expect.loguser""Off");

$stream fopen ("expect://ssh root@remotehost uptime""r");

$cases = array (
  array (
=> "password:"=> PASSWORD)
);

switch (
expect_expectl ($stream$cases)) {
 case 
PASSWORD:
  
fwrite ($stream"password\n");
  break;
 
 default:
  die (
"Error was occurred while connecting to the remote host!\n");
}

while (
$line fgets ($stream)) {
  print 
$line;
}
fclose ($stream);
?>

The following example connects to the remote host, determines whether installed OS is for 32 or 64 bit, then runs update for specific package.

Example#2 Another Expect Usage Example

<?php
ini_set 
("expect.timeout", -1);
ini_set ("expect.loguser""Off");

$stream expect_popen ("ssh root@remotehost");

while (
true) {
    switch (
expect_expectl ($stream, array (
            array (
"password:"PASSWORD), // SSH is asking for password
            
array ("yes/no)?"YESNO), // SSH is asking whether to store the host entry
            
array ("~$ "SHELLEXP_EXACT), // We've got the shell!
    
))) {
        case 
PASSWORD:
            
fwrite ($stream"secret\n");
            break;

        case 
YESNO:
            
fwrite ($stream"yes\n");
            break;

        case 
SHELL:
            
fwrite ($stream"uname -a\n");
            while (
true) {
                    switch (
expect_expectl ($stream, array (
                            array (
"~$ "SHELLEXP_EXACT), // We've got the shell!
                            
array ("^Linux.*$"UNAMEEXP_REGEXP), // uname -a output
                    
), $match)) {
                        case 
UNAME:
                            
$uname .= $match[0];
                            break;
                        
                        case 
SHELL:
                            
// Run update:
                            
if (strstr ($uname"x86_64")) {
                                    
fwrite ($stream"rpm -Uhv http://mirrorsite/somepath/some_64bit.rpm\n");
                            } else {
                                    
fwrite ($stream"rpm -Uhv http://mirrorsite/somepath/some_32bit.rpm\n");
                            }
                            
fwrite ($stream"exit\n");
                            break 
2;
                    
                        case 
EXP_TIMEOUT:
                        case 
EXP_EOF:
                            break 
2;

                        default:
                            die (
"Error has occurred!\n");
                    }
            }
            break 
2;

        case 
EXP_TIMEOUT:
        case 
EXP_EOF:
            break 
2;

        default:
            die (
"Error has occurred!\n");
    }
}

fclose ($stream);
?>

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PHP Manual