Form

<?php

namespace Application\Form;

use Zend\InputFilter;
use Zend\Form\Element;
use Zend\Form\Form;

class UploadForm extends Form {

    public function __construct($name = null, $options = array()) {
        parent::__construct($name, $options);
        $this->addElements();
        $this->addInputFilter();
    }

    public function addElements() {
        // File Input
        $file = new Element\File('image-file');
        $file->setLabel('Avatar Image Upload')
                ->setAttribute('id', 'image-file')
                ->setAttribute('multiple', true);   // That's it
        $this->add($file);
    }

    public function addInputFilter() {
        $inputFilter = new InputFilter\InputFilter();

        // File Input
        $fileInput = new InputFilter\FileInput('image-file');
        $fileInput->setRequired(true);

        // You only need to define validators and filters
        // as if only one file was being uploaded. All files
        // will be run through the same validators and filters
        // automatically.
        $fileInput->getValidatorChain()
//                ->attachByName('filesize', array('max' => 204800))
                ->attachByName('filemimetype', array('mimeType' => 'image/png,image/x-png'))
//                ->attachByName('fileimagesize', array('maxWidth' => 100, 'maxHeight' => 100))
                ;

        // All files will be renamed, i.e.:
        //   ./data/tmpuploads/avatar_4b3403665fea6.png,
        //   ./data/tmpuploads/avatar_5c45147660fb7.png
        $fileInput->getFilterChain()->attachByName(
                'filerenameupload', array(
            'target' => './data/tmpuploads/avatar.png',
            'randomize' => true,
                )
        );
        $inputFilter->add($fileInput);

        $this->setInputFilter($inputFilter);
    }

}