How to compare directories and files on an FTP server via PHP

How to compare directories and files on an FTP server through PHP

In web development, sometimes we need to compare local files with files on the FTP server to ensure consistency between the two. . PHP provides some functions and classes to implement this functionality. This article will introduce how to use PHP to compare directories and files on an FTP server, and provide relevant code examples.

First, we need to connect to the FTP server. PHP provides the ftp_connect() function to establish a connection with the FTP server. The following is a sample code to connect to the FTP server:

<?php
$ftp_server = 'ftp.example.com';
$ftp_username = 'your_username';
$ftp_password = 'your_password';

$ftp_connection = ftp_connect($ftp_server);
if (!$ftp_connection) {
    die('无法连接到FTP服务器');
}

$login_result = ftp_login($ftp_connection, $ftp_username, $ftp_password);
if (!$login_result) {
    die('无法登录到FTP服务器');
}

// 连接成功，可以进行其他操作
?>

After the connection is successful, we can use the ftp_nlist() function to obtain the file list in the specified directory on the FTP server. The following is a sample code to get the file list of a specified directory on the FTP server:

<?php
$ftp_directory = '/path/to/directory';
$file_list = ftp_nlist($ftp_connection, $ftp_directory);

if (!$file_list) {
    die('无法获取文件列表');
}

// 输出文件列表
foreach ($file_list as $file) {
    echo $file . '<br>';
}

// 可以继续进行其他操作
?>

Next, we need to compare the local files with the files on the FTP server. You can use standard PHP file functions to process local files, and use the ftp_get() function to download files on the FTP server. Here is a sample code that compares local files to files on the FTP server:

<?php
$local_directory = '/path/to/local_directory';

// 循环遍历本地文件
foreach (glob($local_directory . '/*.*') as $local_file) {
    $local_file_name = basename($local_file);

    // 检查本地文件是否存在于FTP服务器上
    if (in_array($local_file_name, $file_list)) {
        echo '文件' . $local_file_name . '在FTP服务器上存在<br>';
    } else {
        echo '文件' . $local_file_name . '在FTP服务器上不存在<br>';
    }
}

// 可以继续进行其他操作
?>

The above code will iterate through all the files in the local directory and check whether they exist on the FTP server. If it exists, "File XXX exists on the FTP server" will be output. If it does not exist, "File XXX does not exist on the FTP server" will be output.

When comparing files, you may also need to compare the consistency of the file contents. You can use PHP's file functions to get the contents of a local file and a file on the FTP server, and then compare them. The following is a sample code that compares the contents of a local file and the file on the FTP server:

<?php
// 获取指定文件的内容
function get_file_content($file_path) {
    $file_content = file_get_contents($file_path);

    // 移除换行符和空格
    $file_content = str_replace(array("", "
", " "), '', $file_content);

    return $file_content;
}

$local_directory = '/path/to/local_directory';

// 循环遍历本地文件
foreach (glob($local_directory . '/*.*') as $local_file) {
    $local_file_name = basename($local_file);

    // 检查本地文件是否存在于FTP服务器上
    if (in_array($local_file_name, $file_list)) {
        $local_file_content = get_file_content($local_file);

        // 下载FTP服务器上的文件
        $ftp_file = tempnam(sys_get_temp_dir(), 'ftp_');
        ftp_get($ftp_connection, $ftp_file, $ftp_directory . '/' . $local_file_name, FTP_BINARY);

        $ftp_file_content = get_file_content($ftp_file);

        // 比较文件内容
        if ($local_file_content === $ftp_file_content) {
            echo '文件' . $local_file_name . '的内容在FTP服务器上与本地文件相同<br>';
        } else {
            echo '文件' . $local_file_name . '的内容在FTP服务器上与本地文件不同<br>';
        }

        // 删除缓存文件
        unlink($ftp_file);
    }
}

// 可以继续进行其他操作
?>

The above code will download the file on the FTP server to a local temporary file, and then compare the local file and the file on the FTP server whether the contents are consistent.

Through the above code example, we can easily compare directories and files on the FTP server in PHP. You can modify and extend it to meet your specific business needs.

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