Convert a flat array of key path strings to a multidimensional array terminating in empty arrays

If a single array of paths

$singleArray = array(
   '/Web',
   '/Web/Test1',
   '/Web/Test2', 
   '/Web/Test2/Subfolder',
   '/Web/Test3',
   '/Public'
);

From that array I want to create a mulitdimensional array, which keeps the keys, but creates subfolders in the correct parent folders. Later, I want to loop over the new array to create a folder tree (but that's not a problem).

The new array should look like this:

$multiArray = array(
   '/Web'=>array(
      '/Web/Test1'=>array(),
      '/Web/Test2'=>array(
          '/Web/Test2/Subfolder'=>array()
      ),
      '/Web/Test3'=>array()
   ),
   '/Public'=>array()
);

The code below will make the array you want. The key to solve your problem is to create a reference to the array every iteration.

<?php
$singleArray = array(
    '/Web',
    '/Web/Test1',
    '/Web/Test2',
    '/Web/Test2/Subfolder',
    '/Web/Test3',
    '/Public'
);

$multiArray = array();

foreach ($singleArray as $path) {
    $parts       = explode('/', trim($path, '/'));
    $section     = &$multiArray;
    $sectionName = '';

    foreach ($parts as $part) {
        $sectionName .= '/' . $part;

        if (array_key_exists($sectionName, $section) === false) {
            $section[$sectionName] = array();
        }

        $section = &$section[$sectionName];
    }
}