如何从平面数组创建多维树数组？

Question

'I have this flat array:

$folders = [
  'test/something.txt',
  'test/hello.txt',
  'test/another-folder/myfile.txt',
  'test/another-folder/kamil.txt',
  'test/another-folder/john/hi.txt'
]

And I need it in the following format:

$folders = [
  'test' => [
     'something.txt',
     'hello.txt',
     'another-folder' => [
       'myfile.txt',
       'kamil.txt',
       'john' => [
         'hi.txt'
       ]
     ]
   ]
];

How do I do this? Thanks.

Answer 1

Recursion is your friend :-)

function createArray($folders, $output){
  if(count($folders) > 2){
    $key = array_shift($folders);
    $output[$key] = createArray(
      $folders, isset($output[$key]) ? $output[$key] : []
    );
  }
  else{
    if(!isset($output[$folders[0]])){
      $output[$folders[0]] = [];
    }
    $output[$folders[0]][] = $folders[1];
  }

  return $output;
}

Keep drilling down until you get to the file name, then add them all together in an array.

You need to call this function for each element in your array, like this:

$newFolders = [];
foreach($folders as $folder){
  $newFolders = createArray(explode('/', $folder), $newFolders);
}

DEMO: https://eval.in/139240