How to copy files and directories in FTP server through PHP

How to copy files and directories in an FTP server through PHP

In web development, it is often necessary to copy files and directories between different servers or different directories. And using the FTP protocol is a common method. PHP provides a series of FTP functions that can easily copy files and directories in an FTP server.

This article will introduce how to use PHP to copy files and directories in an FTP server, and provide corresponding code examples.

1. Connect to FTP server

First, we need to connect to the target server using FTP. PHP provides the ftp_connect function to establish a connection with the FTP server.

$ftp_server = "ftp.example.com";
$ftp_user = "username";
$ftp_pass = "password";

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

In the above code, we specify the address, username and password of the FTP server, and use the ftp_connect function to connect to the server. If the connection fails, an error message will be output.

2. Log in to the FTP server

After connecting to the FTP server, we need to use the ftp_login function to log in to the server.

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

if ($login_result) {
    echo "成功登录到FTP服务器";
} else {
    echo "登录失败";
}

In the above code, we use the ftp_login function to log in to the FTP server and output the corresponding information based on the login result.

3. Copy files

Next, we can use the ftp_get function to copy files from the source folder to the target folder. The following is a sample code:

$source_file = "/source_folder/file.txt";
$target_file = "/target_folder/file.txt";

$copy_result = ftp_get($conn_id, $target_file, $source_file, FTP_BINARY);

if ($copy_result) {
    echo "文件复制成功";
} else {
    echo "文件复制失败";
}

In the above code, we specify the path of the source file and the target file, and use the ftp_get function to copy the source file to the target file. If the copy is successful, the corresponding information will be output.

4. Copy Directory

To copy the entire directory, we need to use a recursive function to copy all the files and subdirectories in the directory. The following is a sample code:

$source_folder = "/source_folder";
$target_folder = "/target_folder";

function copy_directory($conn_id, $source_folder, $target_folder) {
    $files = ftp_nlist($conn_id, $source_folder);

    foreach ($files as $file) {
        if (is_dir($file)) {
            $sub_folder = str_replace($source_folder, $target_folder, $file);

            if (!ftp_mkdir($conn_id, $sub_folder)) {
                die("无法创建目录 " . $sub_folder);
            }

            copy_directory($conn_id, $file, $sub_folder);
        } else {
            $new_file = str_replace($source_folder, $target_folder, $file);

            if (!ftp_get($conn_id, $new_file, $file, FTP_BINARY)) {
                die("无法复制文件 " . $file);
            }
        }
    }
}

copy_directory($conn_id, $source_folder, $target_folder);

echo "目录复制成功";

In the above code, we have defined a recursive function called copy_directory, which will iterate through all the files and subdirectories in the source directory and copy them to the target directory. The function uses the ftp_nlist function to obtain the list of files and subdirectories in the directory, uses the ftp_mkdir function to create the directory, and uses the ftp_get function to copy files. If an error occurs during the copying process, the corresponding error message will be output.

5. Disconnect FTP connection

Finally, we need to use the ftp_close function to disconnect from the FTP server.

ftp_close($conn_id);

In the above code, we use the ftp_close function to disconnect from the FTP server.

Summary

This article introduces how to use PHP to copy files and directories in an FTP server. By using FTP functions, we can easily connect to the FTP server, log into the server, copy files and directories, and eventually disconnect from the server. The code examples provided above can be used as a reference for you to copy FTP files and directories, and you can modify and optimize them according to actual needs. Using these methods, you will be able to copy files and directories more efficiently.

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