PHP 및 FTP: 간편한 파일 동기화를 위한 방법 및 전략

<?php
$ftp_server = "ftp.example.com";
$ftp_user = "user";
$ftp_pass = "password";

$conn_id = ftp_connect($ftp_server); // 连接FTP服务器
$login_result = ftp_login($conn_id, $ftp_user, $ftp_pass); // 登录FTP服务器

if ($conn_id && $login_result) {
   echo "成功连接到服务器";
   // 在这里可以执行其他相关操作，如上传、下载文件等
} else {
   echo "无法连接到服务器";
}

ftp_close($conn_id); // 关闭FTP连接
?>

<?php
$ftp_server = "ftp.example.com";
$ftp_user = "user";
$ftp_pass = "password";

$local_file = "path/to/local/file.txt"; // 本地文件路径
$remote_file = "path/to/remote/file.txt"; // 远程文件路径

$conn_id = ftp_connect($ftp_server);
$login_result = ftp_login($conn_id, $ftp_user, $ftp_pass);

if ($conn_id && $login_result) {
   // 上传文件
   if (ftp_put($conn_id, $remote_file, $local_file, FTP_BINARY)) {
       echo "文件上传成功";
   } else {
       echo "文件上传失败";
   }
} else {
   echo "无法连接到服务器";
}

ftp_close($conn_id);
?>

<?php
$ftp_server = "ftp.example.com";
$ftp_user = "user";
$ftp_pass = "password";

$local_file = "path/to/local/file.txt"; // 本地文件路径
$remote_file = "path/to/remote/file.txt"; // 远程文件路径

$conn_id = ftp_connect($ftp_server);
$login_result = ftp_login($conn_id, $ftp_user, $ftp_pass);

if ($conn_id && $login_result) {
   // 下载文件
   if (ftp_get($conn_id, $local_file, $remote_file, FTP_BINARY)) {
       echo "文件下载成功";
   } else {
       echo "文件下载失败";
   }
} else {
   echo "无法连接到服务器";
}

ftp_close($conn_id);
?>

<?php
$ftp_server = "ftp.example.com";
$ftp_user = "user";
$ftp_pass = "password";

$local_file = "path/to/local/file.txt"; // 本地文件路径
$remote_file = "path/to/remote/file.txt"; // 远程文件路径

$conn_id = ftp_connect($ftp_server);
$login_result = ftp_login($conn_id, $ftp_user, $ftp_pass);

if ($conn_id && $login_result) {
   // 获取本地文件的时间戳和大小
   $local_modified = filemtime($local_file);
   $local_size = filesize($local_file);

   // 获取远程文件的时间戳和大小
   $remote_modified = ftp_mdtm($conn_id, $remote_file);
   $remote_size = ftp_size($conn_id, $remote_file);

   // 判断是否需要同步
   if ($local_modified > $remote_modified || $local_size != $remote_size) {
       // 上传文件
       if (ftp_put($conn_id, $remote_file, $local_file, FTP_BINARY)) {
           echo "文件同步成功";
       } else {
           echo "文件同步失败";
       }
   } else {
       echo "文件已经是最新";
   }
} else {
   echo "无法连接到服务器";
}

ftp_close($conn_id);
?>