XXXIV. 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.

Tabelle 1. Expect Konfigurationsoptionen

NameStandardVeränderbarChangelog
expect.timeout"10"PHP_INI_ALL 
expect.loguser"1"PHP_INI_ALL 
expect.logfile""PHP_INI_ALL 
For further details and definitions of the PHP_INI_* constants, see the Anhang G.

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.

Anmerkung: 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.

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

Resource Typen

Diese Erweiterung definiert keine Resource-Typen.

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.

Beispiel 1. Expect Usage Example

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

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

$cases = array (
  array (
0 => "password:", 1 => 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);
?>
Inhaltsverzeichnis
expect_expectl -- Waits until the output from a process matches one of the patterns, a specified time period has passed, or an EOF is seen
expect_popen -- Exectute command via Bourne shell, and open the PTY stream to the process