PHP と FTP: Web サイト開発中に複数の環境でファイルを同期する

<?php
$ftp_server = "ftp.example.com";
$ftp_username = "username";
$ftp_password = "password";
$local_file = "local_file.txt";
$remote_file = "remote_file.txt";

$conn = ftp_connect($ftp_server);
$login = ftp_login($conn, $ftp_username, $ftp_password);

if ($conn && $login) {
    // 打开本地文件
    $handle = fopen($local_file, 'r');
    
    // 上传文件
    if (ftp_fput($conn, $remote_file, $handle, FTP_BINARY)) {
        echo "文件上传成功！";
    } else {
        echo "文件上传失败！";
    }
    
    // 关闭文件和FTP连接
    fclose($handle);
    ftp_close($conn);
} else {
    echo "FTP连接失败！";
}
?>

<?php
class FTP
{
    private $conn;
    
    public function __construct($server, $username, $password)
    {
        $this->conn = ftp_connect($server);
        ftp_login($this->conn, $username, $password);
    }
    
    public function upload($local_file, $remote_file)
    {
        $handle = fopen($local_file, 'r');
        $result = ftp_fput($this->conn, $remote_file, $handle, FTP_BINARY);
        fclose($handle);
        
        return $result;
    }
    
    public function download($remote_file, $local_file)
    {
        $handle = fopen($local_file, 'w');
        $result = ftp_fget($this->conn, $handle, $remote_file, FTP_BINARY);
        fclose($handle);
        
        return $result;
    }
    
    public function delete($remote_file)
    {
        return ftp_delete($this->conn, $remote_file);
    }
    
    public function listFiles()
    {
        return ftp_nlist($this->conn, ".");
    }
    
    public function __destruct()
    {
        ftp_close($this->conn);
    }
}
?>