PHP Concatenation of a constant with a string in the definition of a constant

Question

I tried many ways to define a constant based on another. Nothing comes out. Google and manuals didn’t help much either.

class Config { const PROJ_ROOT = "/srv/www/htdocs/inet_shop/admin"; const IMAGES_DIR = self::PROJ_ROOT . "/images"; // тут ошибка // ... }

I run tests through the console and issue:

 PHP Parse error: syntax error, unexpected '.', expecting ',' or ';' in /srv/www/htdocs/inet_shop/admin/config.php on line 5

Why?

For "Support for constant expressions was added in PHP 5.6.0.", The manual says, by the way.

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