php clear empty folders

As time goes by and files are continuously manipulated, many empty folders may accumulate on your server. They do not take up excessive disk space, but they may have an impact on file system performance and cleanliness. Therefore, it is necessary to clear these empty folders regularly.

This article will introduce how to use PHP to write a program to clear empty folders.

1. Get directory list

First, we need to list all the folders that need to be checked and cleared. We can use PHP's scandir() function to get a list of all files and folders in the target directory.

function getDirs($dir) {
    $dirs = array_diff(scandir($dir), array(".", ".."));
    return $dirs;
}

The above function will traverse the target directory and return a folder list that does not include the current directory (".") and the previous directory ("..").

2. Check if the folder is empty

We need to check if each folder is empty. We can use PHP's glob() function to get all the files under a folder and determine whether there are other files in the folder. If there are no files, it is marked as empty and can be deleted later.

function isEmpty($dir) {
    $isEmpty = true;
    $files = glob($dir.'/*');
    foreach ($files as $file) {
        if (is_dir($file)) {
            $isEmpty = false; // 如果有任何子文件夹则不是空文件夹
        }
        else {
            $isEmpty = false;
        }
    }
    return $isEmpty;
}

This function will return a Boolean value indicating whether the folder is empty.

3. Traverse the folder recursively

We also need to recursively traverse the folder and its subfolders to find all empty folders. We can use the getDirs() function written above to get the list of folders, for each folder we will check if it is empty and if so, add it to the empty folder list.

function getEmptyDirs($dir) {
    $emptyDirs = array();
    $dirs = getDirs($dir);
    foreach ($dirs as $d) {
        $subdir = $dir.'/'.$d;
        if (is_dir($subdir)) {
            if (isEmpty($subdir)) {
                $emptyDirs[] = $subdir;
            }
            else {
                $subdirs = getEmptyDirs($subdir);
                if (!empty($subdirs)) {
                    $emptyDirs = array_merge($emptyDirs, $subdirs);
                }
            }
        }
    }
    return $emptyDirs;
}

This function will return a list of all empty folders by recursively iterating through the folders and checking if each subfolder is empty.

4. Delete empty folders

Finally, we need to write a function to delete empty folders. We can use PHP's rmdir() function to delete a folder. However, since this function can only be called on an empty directory, we need to check if the folder is empty first, otherwise it cannot be deleted. We can also choose to use the unlink() function and loop statements to delete non-empty directories and their contents.

function deleteEmptyDirs($dir) {
    $emptyDirs = getEmptyDirs($dir);
    foreach ($emptyDirs as $emptyDir) {
        if (is_dir($emptyDir)) {
            rmdir($emptyDir);
            echo "Deleted empty directory: ".$emptyDir."\n";
        }
    }
}

The above function will output the path of each empty folder deleted.

5. Full code

function getDirs($dir) {
    $dirs = array_diff(scandir($dir), array(".", ".."));
    return $dirs;
}

function isEmpty($dir) {
    $isEmpty = true;
    $files = glob($dir.'/*');
    foreach ($files as $file) {
        if (is_dir($file)) {
            $isEmpty = false; // 如果有任何子文件夹则不是空文件夹
        }
        else {
            $isEmpty = false;
        }
    }
    return $isEmpty;
}

function getEmptyDirs($dir) {
    $emptyDirs = array();
    $dirs = getDirs($dir);
    foreach ($dirs as $d) {
        $subdir = $dir.'/'.$d;
        if (is_dir($subdir)) {
            if (isEmpty($subdir)) {
                $emptyDirs[] = $subdir;
            }
            else {
                $subdirs = getEmptyDirs($subdir);
                if (!empty($subdirs)) {
                    $emptyDirs = array_merge($emptyDirs, $subdirs);
                }
            }
        }
    }
    return $emptyDirs;
}

function deleteEmptyDirs($dir) {
    $emptyDirs = getEmptyDirs($dir);
    foreach ($emptyDirs as $emptyDir) {
        if (is_dir($emptyDir)) {
            rmdir($emptyDir);
            echo "Deleted empty directory: ".$emptyDir."\n";
        }
    }
}

// 用例
$targetDir = "/path/to/target/directory";
deleteEmptyDirs($targetDir);

6. Conclusion

Using the above method, you can regularly clean empty folders in the server, thereby Improves overall file system performance and cleanliness. Additionally, this script can be set to run periodically to ensure that empty folders do not accumulate and impact file system performance.

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