ssh2:// — 安全外壳协议 2
ssh2.shell:// ssh2.exec:// ssh2.tunnel:// ssh2.sftp:// ssh2.scp:// (PECL)
注意: 该封装器默认没有激活
为了使用 ssh2.*:// 封装协议，必须从 » PECL 中安装有效的 » SSH2 扩展。
除了支持传统的 URI 登录信息，ssh2 封装协议也支持通过 URL 的主机（host）部分来复用打开连接。
示例 #1 从一个活跃的连接中打开流
<?php
$session = ssh2_connect('example.com', 22);
ssh2_auth_pubkey_file($session, 'username', '/home/username/.ssh/id_rsa.pub',
'/home/username/.ssh/id_rsa', 'secret');
$stream = fopen("ssh2.tunnel://$session/remote.example.com:1234", 'r');
?>示例 #2 $session 变量必须保持可用！
为了使用 ssh2.*://$session 封装协议， 必须保留 $session 资源变量。下面的代码就不会有预期的效果：
<?php
$session = ssh2_connect('example.com', 22);
ssh2_auth_pubkey_file($session, 'username', '/home/username/.ssh/id_rsa.pub',
'/home/username/.ssh/id_rsa', 'secret');
$connection_string = "ssh2.sftp://$session/";
unset($session);
$stream = fopen($connection_string . "path/to/file", 'r');
?>unset() 会关闭 session，因为 $connection_string 不保存对 $session 变量的引用，只是源自它的字符串转换。当离开（像函数）作用域隐性调用 unset() 时，也会发生这种情况。
The "password" context option can also be used to provide the passphrase for the keyfile supplied by "privkey_file" and "pubkey_file".Note this bug: https://bugs.php.net/bug.php?id=58573Encrypted keys may not work unless you build libssh2 against openssl. (It only worked for me on Debian Wheezy once I recompiled the library).Be aware that opendir is currently broken on sftp root directories, but you can work around it by appending a dot. See https://bugs.php.net/bug.php?id=64169 and http://stackoverflow.com/a/16238476/69173.Please beware of a PHP bug, noted by thomas at gielfeldt dot dk, that you must intval() the connection variable before putting it in the connection string :<?php$connection = ssh2_connect('shell.example.com', 22);ssh2_auth_password($connection, 'username', 'password');$sftp = ssh2_sftp($connection);// See: https://bugs.php.net/bug.php?id=73597$stream = fopen("ssh2.sftp://" . intval($sftp) . "/path/to/file", 'r');?><?php// Connect with public key.$session = ssh2_connect('example.com', 22);$result = ssh2_auth_pubkey_file($session, 'remote-username', '/home/local-username/.ssh/id_rsa.pub', '/home/local-username/.ssh/id_rsa', 'secret');// Setup sftp stream wrapper$sftp = ssh2_sftp($session);// See: https://bugs.php.net/bug.php?id=73597$connection_string = 'ssh2.sftp://' . intval($sftp);// List files in remote homedir.$i = new \RecursiveDirectoryIterator("$connection_string/home/remote-username");$r = new \RecursiveIteratorIterator($i);foreach ($r as $f) { print $f->getPathname() . "\n";}?>