Step-by-step tutorial: How to use php extension FTP for file transfer

Step-by-step tutorial: How to use PHP to extend FTP for file transfer

Introduction:
FTP (File Transfer Protocol) is a standard network protocol used to transfer files between computers. In web development, it is often necessary to upload files from the local to the server or download files from the server to the local through FTP. PHP provides FTP extensions to implement these functions. This article will step by step introduce how to use PHP extension FTP for file transfer.

Preparation:
Before you start, please make sure you have installed PHP and enabled the FTP extension. You can enable the FTP extension by editing the php.ini file and remove the semicolon before the following code:

;extension=ftp

Step 1: Establish an FTP connection
First, we need to establish a connection with the FTP server. You can use the ftp_connect() function to establish a connection, as shown below:

$ftp_server = "ftp.example.com";
$ftp_username = "username";
$ftp_password = "password";
$ftp_port = 21;

// 建立FTP连接
$conn = ftp_connect($ftp_server, $ftp_port);
if (!$conn) {
    die("无法连接到FTP服务器");
}

// 登录FTP服务器
$login_result = ftp_login($conn, $ftp_username, $ftp_password);
if (!$login_result) {
    die("登录失败");
}

// 设置被动模式
ftp_pasv($conn, true);

// 在这里可以进行文件传输操作

Step 2: Upload files to the server
To upload files to the server, you can use ftp_put( )function. The following is a sample code:

$local_file = "/path/to/local/file.txt";
$remote_file = "/path/to/remote/file.txt";

// 上传文件
if (ftp_put($conn, $remote_file, $local_file, FTP_BINARY)) {
    echo "文件上传成功";
} else {
    echo "文件上传失败";
}

Step 3: Download files from the server to the local
To download files from the server to the local, you can use the ftp_get() function. The following is a sample code:

$local_file = "/path/to/local/file.txt";
$remote_file = "/path/to/remote/file.txt";

// 下载文件
if (ftp_get($conn, $local_file, $remote_file, FTP_BINARY)) {
    echo "文件下载成功";
} else {
    echo "文件下载失败";
}

Step 4: Close the FTP connection
When the file transfer operation is completed, be sure to remember to close the FTP connection, you can use the ftp_close() function. The following is a sample code:

// 关闭FTP连接
ftp_close($conn);

Summary:
This article describes how to use PHP to extend FTP for file transfer. First, establish a connection with the FTP server, and then you can use the ftp_put() function to upload files to the server, or use the ftp_get() function to download files from the server to the local. Finally, remember to close the FTP connection. I hope that readers can successfully use PHP to extend FTP for file transfer through the introduction and sample code of this article.

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