如何通过变量调用常量

Question

I have a function which I use like this

$i18n_APP = new i18n($_SERVER['DOCUMENT_ROOT'].'module/'.$modid.'/lang/lang_{LANGUAGE}.ini',        
$_SERVER['DOCUMENT_ROOT'].'lang/langcache/', 'en');
$i18n_APP->setPrefix('APP'.$appid);
$i18n_APP->init();

Normally I call the function by the prefix, like this

APP($el)

Now I have to use a variable prefix, cause I use the $appid, so I can't code it like the way above.

Is there any way to make it in a dynamic way maybe like this App.$appid($el)

Hope I could explain what I tried to do.

By the way, maybe I don't need to do it, if I find a way to "add" different languagefiles to the function. For the moment I initiate a new class for every languagefile.

Answer 1

I find a way to solve it

function langtag($prefix, $value)
{
  return $prefix($value);
}

and

$moid=4;
echo langtag('APP'.$modid,$el)