php - Access constant in class

I try to access a constant in a
class:

file1.php

[...]
            
define('SUBDOMAIN','name');
require_once
            'file2.php';
[...]

file2.php

[...]
class
            Gdl_Ute extends Response_Model { 
public $table =
            SUBDOMAIN.'zi_utp';

public function
            statuses()
{

[...]

I've
used some variants like:

public
            function __construct()
{
self::$table =
            SUBDOMAIN.'zi_utp';
}

But
there is always an error like:

PHP
            Parse error: syntax error, unexpected '.', expecting ',' or
            ';'

or

syntax
            error, unexpected
            T_VARIABLE

Thanks
very much for any hints! I've also read other similar questions on stackoverflow, but
none has answered this problem correctly
:/

UPDATE
Now
I've test the following
solutions:

file2.php

public
            $table;
public function
            __construct()

{
self::$table =
            SUBDOMAIN.'zi_utp';
}

OR

file1.php

define('SUBDOMAIN',$subdomain);

const
            SUBDOMAIN =
            $subdomain;

RESULT

Access
            to undeclared static property OR
syntax error, unexpected
            T_VARIABLE

class="post-text" itemprop="text">

class="normal">Answer

Use
const to define your constant. have a look href="http://php.net/manual/en/language.oop5.constants.php"
rel="nofollow">here