How to monitor file changes on an FTP server using PHP

How to use PHP to monitor file changes on the FTP server

Introduction:
FTP (File Transfer Protocol) is a commonly used file transfer protocol that is widely used for file upload, download and management. When we need to monitor file changes on the FTP server, we can use PHP to implement this function. This article will introduce how to use PHP to monitor file changes on the FTP server, and provide code examples for readers' reference.

Part One: Connect to FTP Server
First, we need to use PHP's FTP function to establish a connection with the FTP server. The following is a sample code:

$ftp_server = "ftp.example.com";
$ftp_username = "your_username";
$ftp_password = "your_password";

// 建立FTP连接
$conn = ftp_connect($ftp_server) or die("无法连接到FTP服务器");

// 登录FTP
if(ftp_login($conn, $ftp_username, $ftp_password)){
    echo "成功登录到FTP服务器
";
} else {
    echo "登录失败
";
}

// 在这里可以进行后续操作

Part 2: Monitoring file changes
After connecting to the FTP server, we can use PHP's FTP function to monitor file changes. The following is a sample code:

// 监控的目录
$monitor_dir = "/path/to/monitor/";

// 获取目录中文件的列表
$file_list = ftp_nlist($conn, $monitor_dir);

// 比较文件列表，查找新增的文件
$remote_files = array_diff($file_list, $local_files);

// 输出新增的文件
foreach ($remote_files as $file) {
    echo "新增文件：$file
";
}

// 更新本地文件列表
$local_files = $file_list;

The above code first obtains the file list in the specified directory on the FTP server, and then compares it with the local file list to find the new files and output them. Finally, the local file list is updated for the next comparison.

Part Three: Scheduled Run Monitoring Script
In order to achieve continuous monitoring of file changes, we can use PHP's scheduled execution tasks. The following is a sample code:

// 每隔10秒监控一次
$interval = 10;

while (true) {
    // 获取目录中文件的列表
    $file_list = ftp_nlist($conn, $monitor_dir);

    // 比较文件列表，查找新增的文件
    $remote_files = array_diff($file_list, $local_files);

    // 输出新增的文件
    foreach ($remote_files as $file) {
        echo "新增文件：$file
";
    }

    // 更新本地文件列表
    $local_files = $file_list;

    // 休眠一段时间
    sleep($interval);
}

The above code will be placed in an infinite loop and perform file monitoring operations at certain intervals. You can adjust the monitoring interval as needed.

Conclusion:
By using PHP's FTP function, we can easily monitor changes in FTP server files. This article introduces how to connect to an FTP server, monitor file changes, and provides corresponding code examples for readers' reference. I hope this article can help you understand and apply PHP to monitor FTP server file changes.

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