// log in at server1.example.com on port 22
if(!($con = ssh2_connect("server1.example.com", 22))){
echo "fail: unable to establish connectionn";
} else {
// try to authenticate with username root, password secretpassword
if(!ssh2_auth_password($con, "root", "secretpassword")) {
echo "fail: unable to authenticaten";
} else {
// allright, we're in!
echo "okay: logged in...n";
// execute a command
if(!($stream = ssh2_exec($con, "ls -al" )) ){
echo "fail: unable to execute commandn";
} else{
// collect returning data from command
stream_set_blocking( $stream, true );
$data = "";
while( $buf = fread($stream,4096) ){
$data .= $buf;
}
fclose($stream);
}
}
第二种方法：外壳
同样道理，你也可以为如下的代码编写函数或者一个类。不过，本文仅仅提供基本观念：
if (!function_exists("ssh2_connect")) die("function ssh2_connect doesn't exist")
// log in at server1.example.com on port 22
if(!($con = ssh2_connect("server1.example.com", 22))){
echo "fail: unable to establish connectionn";
} else {
// try to authenticate with username root, password secretpassword
if(!ssh2_auth_password($con, "root", "secretpassword")) {
echo "fail: unable to authenticaten";
} else {
// allright, we're in!
echo "okay: logged in...n";
// create a shell
if(!($shell = ssh2_shell($con, 'vt102', null, 80, 40, SSH2_TERM_UNIT_CHARS))){
echo "fail: unable to establish shelln";
} else{
stream_set_blocking( $shell, true );
// send a command
fwrite($shell,"ls -aln");
sleep(1);
// & collect returning data
$data = "";
while( $buf = fread($shell,,4096) ){
$data .= $buf;
}
fclose($shell);
}
}
}
小提示：
有时服务器忙碌，或者一个连接出错，缓冲区没有数据，PHP脚本就会停止从一个命令输出(即使命令并没有完成!)中收集数据。你可以为此进行如下的操作：
ssh2_exec($con, 'ls -al; echo "__COMMAND_FINISHED__"' );
现在，在你不断地检查缓冲区的循环中，只需要看一下COMMAND_FINISHED。因为你就可以知道你拥有了所有的数据。为了避免无限循环(死循环)，可以用一个10秒的超时限制：
$time_start = time();
$data = "";
while( true ){
$data .= fread($stream, 4096);
if(strpos($data,"__COMMAND_FINISHED__") !== false){
echo "okay: command finishedn";
break;
}
if( (time()-$time_start) > 10 ){
echo "fail: timeout of 10 seconds has been reachedn";
break;
}
}
在上面的例子中，你最好将stream_set_blocking设为false。
通过SSH发送文件
ssh2_scp_send($con, "/tmp/source.dat", "/tmp/dest.dat", 0644);
如果不能正常工作
请检查如下的几个方面：
依照本文检查你操作的每一步
在服务器端，在sshd_config 中必须启用“PasswordAuthentication yes”。在大多数服务器上默认值是yes，不过有些情况下，你可能需要将下面的一行加入到文件中，即亲自动手打开这个功能：
/etc/ssh/sshd_config:
# Change to yes to enable tunnelled clear text passwords
PasswordAuthentication yes
如果作了改变，就需要重新启动SSH：
/etc/init.d/ssh restart
