PHP chown() 函数

bool chown ( string $filename , mixed $user )

<?php
// 将文件所有者改为 www-data
$filename = "website.log";
$user = "www-data";

if (chown($filename, $user)) {
    echo "文件所有者已成功修改为 $user";
} else {
    echo "文件所有者修改失败";
}
?>

<?php
// 使用用户ID来修改文件所有者
$filename = "database.conf";
$uid = 33; // 通常 www-data 用户的UID是33

if (chown($filename, $uid)) {
    echo "文件所有者已成功修改，UID: $uid";

    // 验证修改结果
    clearstatcache();
    $current_uid = fileowner($filename);
    echo "\n当前文件所有者UID: $current_uid";
} else {
    echo "文件所有者修改失败";
}
?>

<?php
function get_file_owner_info($filename) {
    if (!file_exists($filename)) {
        return "文件不存在";
    }

    // 获取文件所有者UID
    $uid = fileowner($filename);

    // 尝试获取用户名
    if (function_exists('posix_getpwuid')) {
        $user_info = posix_getpwuid($uid);
        $username = $user_info['name'];
    } else {
        $username = "未知 (UID: $uid)";
    }

    return [
        'uid' => $uid,
        'username' => $username,
        'permissions' => fileperms($filename)
    ];
}

// 使用示例
$file = "app.php";
$info = get_file_owner_info($file);

echo "文件名: $file\n";
echo "所有者UID: " . $info['uid'] . "\n";
echo "所有者用户名: " . $info['username'] . "\n";
echo "文件权限: " . decoct($info['permissions'] & 0777);
?>

<?php
/**
 * 批量修改目录下所有文件的所有者
 * 注意：需要root权限执行
 */
function batch_chown($directory, $user, $recursive = true) {
    if (!is_dir($directory)) {
        return ['error' => '目录不存在'];
    }

    // 检查权限
    if (posix_getuid() != 0) {
        return ['error' => '需要root权限执行此操作'];
    }

    $files = [];
    $success_count = 0;
    $fail_count = 0;

    // 扫描目录
    $iterator = $recursive
        ? new RecursiveIteratorIterator(new RecursiveDirectoryIterator($directory))
        : new DirectoryIterator($directory);

    foreach ($iterator as $file) {
        if ($file->isDot()) {
            continue;
        }

        $filepath = $file->getPathname();

        if (chown($filepath, $user)) {
            $success_count++;
            $files[] = [
                'file' => $filepath,
                'status' => 'success'
            ];
        } else {
            $fail_count++;
            $files[] = [
                'file' => $filepath,
                'status' => 'failed',
                'error' => error_get_last()['message'] ?? '未知错误'
            ];
        }
    }

    return [
        'total' => $success_count + $fail_count,
        'success' => $success_count,
        'fail' => $fail_count,
        'files' => $files
    ];
}

// 使用示例（需要在root权限下运行）
/*
$result = batch_chown('/var/www/html/uploads', 'www-data');
if (isset($result['error'])) {
    echo "错误: " . $result['error'];
} else {
    echo "总共处理: {$result['total']} 个文件\n";
    echo "成功: {$result['success']} 个文件\n";
    echo "失败: {$result['fail']} 个文件";
}
*/
?>

<?php
function safe_chown($filename, $user) {
    // 检查文件是否存在
    if (!file_exists($filename)) {
        return [
            'success' => false,
            'message' => "文件不存在: $filename"
        ];
    }

    // 检查当前用户权限
    $current_uid = posix_getuid();
    if ($current_uid != 0) {
        return [
            'success' => false,
            'message' => "需要root权限执行此操作"
        ];
    }

    // 检查目标用户是否存在
    if (is_string($user)) {
        // 用户名
        $user_info = posix_getpwnam($user);
        if (!$user_info) {
            return [
                'success' => false,
                'message' => "用户不存在: $user"
            ];
        }
    } elseif (is_int($user)) {
        // 用户ID
        $user_info = posix_getpwuid($user);
        if (!$user_info) {
            return [
                'success' => false,
                'message' => "用户ID不存在: $user"
            ];
        }
    } else {
        return [
            'success' => false,
            'message' => "无效的用户参数类型"
        ];
    }

    // 记录原始所有者
    $original_owner = fileowner($filename);
    $original_info = posix_getpwuid($original_owner);

    // 尝试修改所有者
    if (chown($filename, $user)) {
        clearstatcache();

        // 验证修改
        $new_owner = fileowner($filename);
        $new_info = posix_getpwuid($new_owner);

        return [
            'success' => true,
            'message' => "文件所有者修改成功",
            'details' => [
                'original' => $original_info['name'] ?? $original_owner,
                'new' => $new_info['name'] ?? $new_owner,
                'file' => $filename
            ]
        ];
    } else {
        $error = error_get_last();
        return [
            'success' => false,
            'message' => "文件所有者修改失败: " . ($error['message'] ?? '未知错误')
        ];
    }
}

// 使用示例
$result = safe_chown('/var/www/html/index.php', 'www-data');
if ($result['success']) {
    echo $result['message'] . "\n";
    echo "原所有者: " . $result['details']['original'] . "\n";
    echo "新所有者: " . $result['details']['new'] . "\n";
    echo "文件: " . $result['details']['file'];
} else {
    echo "错误: " . $result['message'];
}
?>

<?php
/**
 * 完整设置文件所有权和权限
 */
function set_file_permissions($filename, $owner, $group, $mode) {
    $results = [];

    // 检查文件是否存在
    if (!file_exists($filename)) {
        return ['error' => '文件不存在'];
    }

    // 设置所有者
    if (chown($filename, $owner)) {
        $results['chown'] = '成功';
    } else {
        $results['chown'] = '失败: ' . (error_get_last()['message'] ?? '');
    }

    // 设置所属组
    if (chgrp($filename, $group)) {
        $results['chgrp'] = '成功';
    } else {
        $results['chgrp'] = '失败: ' . (error_get_last()['message'] ?? '');
    }

    // 设置权限
    if (chmod($filename, $mode)) {
        $results['chmod'] = '成功';
    } else {
        $results['chmod'] = '失败: ' . (error_get_last()['message'] ?? '');
    }

    // 验证最终设置
    clearstatcache();
    $results['final_owner'] = fileowner($filename);
    $results['final_group'] = filegroup($filename);
    $results['final_perms'] = decoct(fileperms($filename) & 0777);

    return $results;
}

// 使用示例
/*
$result = set_file_permissions(
    '/var/www/html/config.php',
    'www-data',
    'www-data',
    0640
);

echo "设置结果:\n";
foreach ($result as $key => $value) {
    echo "$key: $value\n";
}
*/
?>