Multilanguage website using PHP ‘define’ & MYSQL

I’m creating a Multilanguage website using ‘define’ for al menu items..

example
define( "WELCOME", "Hello" );
echo WELCOME ; // shows Hello

Now i need to do this with menu items loaded from MYSQL, so for
example

define( "WELCOME", "Hello " );
echo $SelectedFromMysql[1]; // $SelectedFromMysql [1] = WELCOME (in
mysql db)

$SelectedFromMysql holds the value ‘WELCOME’, only instead of showing
‘Hello’ it just dhows welcome. Does anyone know hoe to fix this ?

Thanks in advance