PHP: empty folders when uploading an image to multiple folders

Question

I've got a very strange behaviour when I'm uploading an image to multiple folders. I'm trying to add the uploaded images to 3 different folders:

• /userimg/original (just the original picture)
• /userimg/100x100 (100px width and 100px heigh + do crop)
• /userimg/1000x1000 (max 1000px width and max 1000px height)

My script fills the first folder with all selected images (in $_FILES), but the other folders are not filled at all. If I put the '100x100'-folder first in my dimensions array, then that's the folder that is filled with images while the others aren't. I've been debugging for 2 days now and I'm getting a little bit nervous :P

Here's my script:

<?php

App::uses('Folder', 'Utility');

class UserImage extends CoasterCmsAppModel
{
    public $useTable = false;

    /** @var array $dimensions Dimensions for photo resizing. */
    public $dimensions = array(
        array(
            'width' => 999999,
            'height' => 999999,
            'crop' => false,
            'autocrop' => false,
            'quality' => 100,
            'folder' => 'original'
        ),
        array(
            'width' => 100,
            'height' => 100,
            'crop' => true,
            'autocrop' => true,
            'quality' => 60,
            'folder' => '100x100'
        ),
        array(
            'width' => 1000,
            'height' => 1000,
            'crop' => false,
            'autocrop' => true,
            'quality' => 80,
            'folder' => '1000x1000'
        )
    );

    public function uploadImages($images) {// this function is called to process the images. $images = $_FILES
        if (!$images || !is_array($images)) {
            throw new NotFoundException(
                __('Invalid data.')
            );
        }

        App::import('Component', 'ImageCropResize.Image');
        $image = new ImageComponent(new ComponentCollection);

        $userImgFolder = WWW_ROOT . 'userimg' . DS;

        foreach ($this->dimensions as $dimension) {
            $userImgDimensionFolder = $userImgFolder . $dimension['folder'] . DS;
            $folder = new Folder($userImgDimensionFolder);

            if (is_null($folder->path)) {
                $folder->create($userImgDimensionFolder, 0755);
            }
        }

        $jsonArray = [];

        foreach ($images['name'] as $key => $imageName) {
            $imageNameCleaned = basename($imageName);
            $imageNameCleaned = str_replace(' ', '-', $imageNameCleaned);
            $imageNameCleaned = strtolower($imageNameCleaned);
            $imageNameCleaned = time() . '-' . $imageNameCleaned;

            foreach ($this->dimensions as $dimension) {
                $userImgDimensionFolder = $userImgFolder . $dimension['folder'] . DS;

                $imagePath = $userImgDimensionFolder . $imageNameCleaned;

                move_uploaded_file($images['tmp_name'][$key], $imagePath);
            }
        }
    }
}

Extra info: here's an example of my $images-array that is loaded into the 'uploadImages' function:

array(
    'name' => array(
        (int) 0 => '1.jpg',
        (int) 1 => '2.jpg',
        (int) 2 => '3.jpg',
        (int) 3 => '4.jpg',
        (int) 4 => '5.jpg',
        (int) 5 => '6.jpg',
        (int) 6 => '7.JPG',
        (int) 7 => '8.jpg'
    ),
    'type' => array(
        (int) 0 => 'image/jpeg',
        (int) 1 => 'image/jpeg',
        (int) 2 => 'image/jpeg',
        (int) 3 => 'image/jpeg',
        (int) 4 => 'image/jpeg',
        (int) 5 => 'image/jpeg',
        (int) 6 => 'image/jpeg',
        (int) 7 => 'image/jpeg'
    ),
    'tmp_name' => array(
        (int) 0 => 'C:\xampp\tmp\phpB877.tmp',
        (int) 1 => 'C:\xampp\tmp\phpB897.tmp',
        (int) 2 => 'C:\xampp\tmp\phpB898.tmp',
        (int) 3 => 'C:\xampp\tmp\phpB8A9.tmp',
        (int) 4 => 'C:\xampp\tmp\phpB8AA.tmp',
        (int) 5 => 'C:\xampp\tmp\phpB8AB.tmp',
        (int) 6 => 'C:\xampp\tmp\phpB8AC.tmp',
        (int) 7 => 'C:\xampp\tmp\phpB8AD.tmp'
    ),
    'error' => array(
        (int) 0 => (int) 0,
        (int) 1 => (int) 0,
        (int) 2 => (int) 0,
        (int) 3 => (int) 0,
        (int) 4 => (int) 0,
        (int) 5 => (int) 0,
        (int) 6 => (int) 0,
        (int) 7 => (int) 0
    ),
    'size' => array(
        (int) 0 => (int) 4498964,
        (int) 1 => (int) 372372,
        (int) 2 => (int) 219612,
        (int) 3 => (int) 15807,
        (int) 4 => (int) 91903,
        (int) 5 => (int) 56157,
        (int) 6 => (int) 138041,
        (int) 7 => (int) 81819
    )
)

Any thoughts to guide me into the right direction? And yes, I do appreciate some extra tips and hints about my PHP code ;)

Edit 1 after feedback by Dorvalla

Here's my new $dimensions array, but this seems not to work:

public $dimensions = array(
    0 => array(
        'width' => 999999,
        'height' => 999999,
        'crop' => false,
        'autocrop' => false,
        'quality' => 100,
        'folder' => 'original'
    ),
    1 => array(
        'width' => 100,
        'height' => 100,
        'crop' => true,
        'autocrop' => true,
        'quality' => 60,
        'folder' => '100x100'
    ),
    2 => array(
        'width' => 1000,
        'height' => 1000,
        'crop' => false,
        'autocrop' => true,
        'quality' => 80,
        'folder' => '1000x1000'
    )
);