Weird format of $_FILES array when having multiple fields

Question

I have a form that has some fields like this:

Answer 1

Here is a function that does that and works with name attributes as:

name="artist[images][]"
name="images[]"
name="image"

Also works with more than one file field:

PHP:

function get_files( $array ) 
{
    $output = array();
    foreach ( $array as $base_key => $file ) {
        if ( is_array($file['name']) ) {
            $file_keys = array_keys( $file['name'] );
            foreach ( $file_keys as $file_key ) {
                if ( is_array( $file['name'][$file_key] ) ) {
                    $keys = array_keys( $file['name'][$file_key] );
                    foreach ( $keys as $key ) {
                        $output[$base_key][$file_key][$key] = array ( 
                            'name' => $file['name'][$file_key][$key], 
                            'type' => $file['type'][$file_key][$key], 
                            'tmp_name' => $file['tmp_name'][$file_key][$key], 
                            'error' => $file['error'][$file_key][$key], 
                            'size' => $file['size'][$file_key][$key] 
                        );
                    }
                } else $output[$base_key][$file_key] = array( 
                    'name' => $file['name'][$file_key], 
                    'type' => $file['type'][$file_key], 
                    'tmp_name' => $file['tmp_name'][$file_key], 
                    'error' => $file['error'][$file_key], 
                    'size' => $file['size'][$file_key] 
                    );

            }
        } else $output[$base_key] = $file;
    }
    return $output;
}