How to Retrieve Subdirectories in PHP, Excluding Root and Directory Traversal Indicators?

Retrieving Subdirectories Using PHP

In PHP, you may encounter the need to access all subdirectories within a specific directory, excluding root and directory traversal indicators. Here's how you can achieve this using two different approaches.

Option 1: Utilizing glob()

The glob() function provides a straightforward way to list files and directories matching a specific pattern. To retrieve only subdirectories, use it with the GLOB_ONLYDIR option:

$subdirectories = glob('*/*', GLOB_ONLYDIR);

Option 2: Employing array_filter

array_filter allows you to filter an array based on a callback function. You can use it to identify subdirectories by excluding "." and ".." and filtering the glob() results:

function is_subdirectory($item) { return is_dir($item) && $item != '.' && $item != '..'; }
$subdirectories = array_filter(glob('*'), 'is_subdirectory');

Usage in a Function

Once you have the array of subdirectories, you can pass it to a function for further processing. For instance, the following function prints the paths of all subdirectories:

function print_subdirectory_paths($subdirectories) {
  foreach ($subdirectories as $subdirectory) {
    echo $subdirectory . PHP_EOL;
  }
}

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