BulletProof\Image::upload PHP Method

    public function upload()
    {
        /* modify variable names for convenience */
        $image = $this;
        $files = $this->_files;
        /* initialize image properties */
        $image->name = $image->getName();
        $image->width = $image->getWidth();
        $image->height = $image->getHeight();
        $image->location = $image->getLocation();
        /* get image sizes */
        list($minSize, $maxSize) = $image->size;
        /* check for common upload errors */
        if ($image->error = $image->uploadErrors($files["error"])) {
            return;
        }
        /* check image for valid mime types and return mime */
        $image->mime = $image->getImageMime($files["tmp_name"]);
        /* validate image mime type */
        if (!in_array($image->mime, $image->mimeTypes)) {
            $ext = implode(", ", $image->mimeTypes);
            $image->error = "Invalid File! Only ({$ext}) image types are allowed";
            return;
        }
        /* check image size based on the settings */
        if ($files["size"] < $minSize || $files["size"] > $maxSize) {
            $min = intval($minSize / 1000) ?: 1;
            $max = intval($maxSize / 1000);
            $image->error = "Image size should be atleast more than min: {$min} and less than max: {$max} kb";
            return;
        }
        /* check image dimension */
        list($allowedWidth, $allowedHeight) = $image->dimensions;
        if ($image->height > $allowedHeight || $image->width > $allowedWidth) {
            $image->error = "Image height/width should be less than ' {$allowedHeight} \\ {$allowedWidth} ' pixels";
            return;
        }
        if ($image->height < 4 || $image->width < 4) {
            $image->error = "Invalid! Image height/width is too small or maybe corrupted";
            return;
        }
        /* set and get folder name */
        $image->fullPath = $image->location . "/" . $image->name . "." . $image->mime;
        /* gather image info for json storage */
        $image->serialize = array("name" => $image->name, "mime" => $image->mime, "height" => $image->height, "width" => $image->width, "size" => $files["size"], "location" => $image->location, "fullpath" => $image->fullPath);
        if ($image->error === "") {
            $moveUpload = $image->moveUploadedFile($files["tmp_name"], $image->fullPath);
            if (false !== $moveUpload) {
                return $image;
            }
        }
        $image->error = "Upload failed, Unknown error occured";
        return false;
    }