PHP命令行编程实例：FTP+SSL简单客户端示例

有同学需要使用SSL+FTP的方式加密传输文件。希望我给封装一个东西，需求就是可以上传文件（PUT）和远端改名（RENAME）就行。
我开始以为SSL+FTP = SFTP，后来发现这个想法好像是错误的。SFTP是跑在SSH协议上面的FTP，而FTPs就像https一样是跑在SSL协议上面的FTP。
示例程序使用了ftp_ssl_connect函数。源代码如下：
#! /bin/php
<?php
if($argc!=8){
echo "Usage:\n";
echo "\t$argv[0] put host port user pass local_file remote_file\n";
echo "\t$argv[0] rename host port user pass old_name new_name\n";
return -1;
}
$host = $argv[2];
$port = $argv[3];
$user = $argv[4];
$pass = $argv[5];
//connect to sftp
$ftps = ftp_ssl_connect($host,$port,10) or die("ERROR:Couldn't connect to $host");
if(@ftp_login($ftps, $user, $pass)){
ftp_pasv($ftps,TRUE);
if($argv[1]== 'put'){
//upload local file
$local_file = $argv[6];
$remote_file = $argv[7];
if(ftp_put($ftps,$remote_file,$local_file,FTP_BINARY)){
echo "PUT Successed.\n";
}else{
echo "PUT Failed.\n";
}
}else if($argv[1] == 'rename'){
//rename remote file
$old_name = $argv[6];
$new_name = $argv[7];
if(ftp_rename($ftps,$old_name,$new_name)){
echo "RENAME Successed.\n";
}else{
echo "RENAME Failed.\n";
}
}
ftp_close($conn_id);
}else{
echo "ERROR:Couldn't login\n";
}
?>

附注：如果使用ftp_ssl_connect函数，需要php支持OpenSSL和FTP才行。