static свойства

<?php
 
abstract class Upload {
 
    protected static $dir;
    protected static $mime_type;
 
    public static function uploadFile($file) {
        if (!self::isSecurity($file)) return false;
        $uploadfile = static::$dir."/".$file['name'];
        return move_uploaded_file($file['tmp_name'], $uploadfile);
    }
    protected static function isSecurity($file) {
        $blacklist = array(".php", ".phtml", ".php3", ".php4", ".html", ".htm");
        foreach ($blacklist as $item) {
            if (preg_match("/$item\$/i", $file['name'])) return false;
        }
        $type = $file['type'];
        for ($i = 0; $i < count(static::$mime_type); $i++) {
            if ($type == static::$mime_type[$i]) break;
            if ($type == static::$mime_type[$i]) break;
            if ($i + 1 == count(static::$mime_type)) return false;
        }
        $size = $file['size'];
        if ($size > 2048000) return false;
        return true;
    }
}

<?php
 
require_once "upload_class.php";
 
class UploadImage extends Upload {
 
    protected static $dir = "images";
    protected static $mime_type = array("image/jpeg", "image/png", "image/gif");
}

UploadImage::uploadFile($_FILES['image']);