File Upload Input

The Zend\FileInput class is a special Input type for uploaded files found in the $_FILES array.

While FileInput uses the same interface as Input, it differs in a few ways:

1. It expects the raw value to be in the $_FILES array format.
2. The validators are run before the filters (which is the opposite behavior of Input). This is so that any is_uploaded_file() validation can be run prior to any filters that may rename/move/modify the file.
3. Instead of adding a NotEmpty validator, it will (by default) automatically add a Zend\Validator\File\UploadFile validator.

The biggest thing to be concerned about is that if you are using a <input type="file"> element in your form, you will need to use the FileInput instead of Input or else you will encounter issues.

Usage of FileInput is essentially the same as Input:

use Zend\Http\PhpEnvironment\Request;
use Zend\Filter;
use Zend\InputFilter\InputFilter;
use Zend\InputFilter\Input;
use Zend\InputFilter\FileInput;
use Zend\Validator;

// Description text input
$description = new Input('description'); // Standard Input type
$description->getFilterChain()           // Filters are run first w/ Input
            ->attach(new Filter\StringTrim());
$description->getValidatorChain()        // Validators are run second w/ Input
            ->attach(new Validator\StringLength(array('max' => 140)));

// File upload input
$file = new FileInput('file');           // Special File Input type
$file->getValidatorChain()               // Validators are run first w/ FileInput
     ->attach(new Validator\File\UploadFile());
$file->getFilterChain()                  // Filters are run second w/ FileInput
     ->attach(new Filter\File\RenameUpload(array(
         'target'    => './data/tmpuploads/file',
         'randomize' => true,
     )));

// Merge $_POST and $_FILES data together
$request  = new Request();
$postData = array_merge_recursive($request->getPost(), $request->getFiles());

$inputFilter = new InputFilter();
$inputFilter->add($description)
            ->add($file)
            ->setData($postData);

if ($inputFilter->isValid()) {           // FileInput validators are run, but not the filters...
    echo "The form is valid\n";
    $data = $inputFilter->getValues();   // This is when the FileInput filters are run.
} else {
    echo "The form is not valid\n";
    foreach ($inputFilter->getInvalidInput() as $error) {
        print_r ($error->getMessages());
    }
}