PHP5中文手册·Expect Functions -- 追寻梦想＞编程乐园＞PHP 编程

简介

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.

需求

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

安装

本 » PECL 扩展未绑定于 PHP 中。安装此 PECL 扩展库的信息可在手册中标题为 PECL 扩展库安装的一章中找到。更多信息如新版本，下载，源文件，维护者信息以及更新日志等可以在这里找到： » http://pecl.php.net/package/expect.

在 PHP 4 中本 PECL 扩展的源程序位于 PHP 源程序中的 ext/ 目录下或者在上面的 PECL 连接中。 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. 在 PHP 4 中本 DLL 位于 PHP Windows 执行包中的 extensions/ 目录下。可以从 » PHP 下载页面或者 » http://snaps.php.net/ 下载此 PECL 扩展的 DLL 文件。

运行时配置

这些函数的行为受 php.ini 的影响。

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

**Expect 配置选项**
名字	默认	可修改范围
expect.timeout	"10"	PHP_INI_ALL
expect.loguser	"1"	PHP_INI_ALL
expect.logfile	""	PHP_INI_ALL

有关 PHP_INI_* 常量进一步的细节与定义参见php.ini 配置选项。

以下是配置选项的简要解释。

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.

Note: 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.

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

资源类型

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

预定义常量

以下常量由本扩展模块定义，因此只有在本扩展模块被编译到 PHP 中，或者在运行时被动态加载后才有效。

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.

范例

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 (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);
?>

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 ($stream, array (
            array ("password:", PASSWORD), // SSH is asking for password
            array ("yes/no)?", YESNO), // SSH is asking whether to store the host entry
            array ("~$ ", SHELL, EXP_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 ("~$ ", SHELL, EXP_EXACT), // We've got the shell!
                            array ("^Linux.*$", UNAME, EXP_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);
?>

Expect Functions

简介

需求

安装

运行时配置

资源类型

预定义常量

范例

Table of Contents