[PHP-NOTES] note 130243 added to reserved.variables.files

If anyone still needs it: class for sorting an array of files of unknown nesting depth

```

class __FILES
{
    protected $currentKey = null;

    protected $input = array();

    protected $output= array();

    protected $requiredFields = array('name', 'type', 'tmp_name', 'error', 'size', 'full_path');

    public function __construct(array $input)
    {
        $this->input = $input;
    }

    public function setRequiredFields(...$_)
    {
        $this->requiredFields = $_;
        return $this;
    }

    public function prepare()
    {
        $this->prepareMultilevelFilesArray($this->input, $this->output);
        return $this;
    }

    public function output()
    {
        return $this->output;
    }

    protected function prepareMultilevelFilesArray($input, &$output)
    {
        if(is_array($input)){
            foreach($input as $key => $values){
                // lock field names `error`, `size`, `name`, `type`, `tmp_name`
                if($this->checkRequiredFields($input)){
                    $this->currentKey = $key;
                    $this->prepareMultilevelFilesArray($values, $output);
                }else
                    if(is_array($values)){
                        $this->prepareMultilevelFilesArray($values, $output[$key]);
                    }else{
                        $output[$key][$this->currentKey] = $values;
                    }
            }
        }else{
            $output[$this->currentKey] = $input;
        }
    }

    protected function checkRequiredFields($input)
    {
        foreach($this->requiredFields as $field){
            if(!isset($input[$field])){ return false;}
        }
        return true;
    }
}

```

Call:

```

print '<form enctype="multipart/form-data" method="POST">';
print '<input type="file" name="s[t][t1][t2][t3][t4][t5][]" multiple="multiple" />';
print '<input type="file" name="s[t][t1][t2][t3][t4][t5]" multiple="multiple" />';
print '<input type="file" name="s[t][t1][t2][][t3][t4][t5]" multiple="multiple" />';
print '<input type="file" name="s[t][t1][t2][][t3][][t4][t5]" multiple="multiple" />';
print '<input type="file" name="s[t][t1][t2][][t3][][t4][t5][]" multiple="multiple" />';
print '<input type="submit"/>';
print '</form>';

$input = $_FILES;
$files = new __FILES($input);
$output = $files->setRequiredFields('name', 'type', 'tmp_name', 'error', 'size'/*, 'full_path'*/)	// key `full_path` not available on PHP-server (`php -S`), and available on apache2-server
	->prepare()->output();

print "<pre>";
print_r([$input, $output]);exit;

```
----
Server IP: 45.112.84.4
Probable Submitter: 80.90.5.137 (proxied: 95.25.128.43)
----
Manual Page -- https://php.net/manual/en/reserved.variables.files.php
Edit        -- https://main.php.net/note/edit/130243
Del: integrated  -- https://main.php.net/note/delete/130243/integrated
Del: useless     -- https://main.php.net/note/delete/130243/useless
Del: bad code    -- https://main.php.net/note/delete/130243/bad+code
Del: spam        -- https://main.php.net/note/delete/130243/spam
Del: non-english -- https://main.php.net/note/delete/130243/non-english
Del: in docs     -- https://main.php.net/note/delete/130243/in+docs
Del: other reasons-- https://main.php.net/note/delete/130243
Reject      -- https://main.php.net/note/reject/130243
Search      -- https://main.php.net/manage/user-notes.php