How can directories be read and sorted alphabetically in PHP?

To read and sort directories alphabetically in PHP, you can use the `scandir()` function to read the contents of a directory and then use `sort()` function to sort the array alphabetically. This will allow you to display the directories in alphabetical order.

// Get the list of directories
$directories = scandir('path/to/directory');

// Remove . and .. from the list
$directories = array_diff($directories, array('..', '.'));

// Sort the directories alphabetically
sort($directories);

// Display the sorted directories
foreach ($directories as $directory) {
    echo $directory . "<br>";
}