public static function checkExtBlackList($file, $black_list) { if (count($black_list) == 0) { return -1; } $fileArr = explode(chr(46), $file["name"]); $lastIndex = count($fileArr) - 1; $fileExt = chr(46) . $fileArr[$lastIndex]; if (!in_array(strtolower($fileExt), $black_list)) { return 1; } else { self::$error = "This file type is not allowed on this server."; return -2; } }