To implement folder traversal output, it is required to use red for folders and blue for files, and to have hierarchical indentation with four spaces,

function myscandir($dir){

//Judge whether the path is valid

//is_dir($dir) or die('Currently is not a directory');

echo $dir,'< /br>';

if (is_dir($dir)) {

# code...

echo ' '.' '.' ';

$files = scandir($dir);

foreach ($files as $file) {

## if($file ! =='.' && $file !== '..'){

echo ' '.' '.' ';

myscandir($file);

}

}

}

How to write this code?