ImageHelper.php

<?php
/**
 * @copyright Copyright (c) 2013 2amigOS! Consulting Group LLC
 * @link http://2amigos.us
 * @license http://www.opensource.org/licenses/bsd-license.php New BSD License
 */
namespace dosamigos\fileupload;

use yii\imagine\Image;
use Imagine\Image\ManipulatorInterface;
use Yii;
use Imagine\Image\Box;

/**
 * ImageHelper manipulates images
 *
 * @author Antonio Ramirez <amigo.cobos@gmail.com>
 * @link http://www.ramirezcobos.com/
 * @link http://www.2amigos.us/
 * @package dosamigos\fileupload
 */
class ImageHelper
{

    public static function saveTemporaryImage($filename, $name, $size, $basePath)
    {
        list($width, $height) = explode('x', str_replace('/', '', $size));

        $runtimeDir = Yii::$app->getRuntimePath() . '/' . $basePath . '/' . $size;
        exec("mkdir -p $runtimeDir");
        $name = $runtimeDir . '/' . $name;

        $file = Image::getImagine()->open($filename);

        if ($file->getSize()->getWidth() < $width) {
            $file->resize($file->getSize()->widen($width));
        }

        if ($file->getSize()->getHeight() < $height) {
            $file->resize($file->getSize()->heighten($height));
        }

        $file->thumbnail(new Box($width, $height), ManipulatorInterface::THUMBNAIL_OUTBOUND)
            ->save($name);

        return $name;
    }

}