Thanks ilinovster

But Constructor not work self::$prefix = 'abc'; When I call in public static function custom_table(){ return self::$_prefix.'table_name'; }

I define method setPrefix() and call self::setPrefix() // working

[php] class Test extends Model {

protected $table = 'lang_values';


// private static $_prefix = '';
/* 
public function __construct(array $attributes = array()) {
	 self::$prefix = 'abc'; 
}

*/

public static function setPrefix() {
   	$prefix = config('app._prefix');
    return $prefix[0];
}

public static function service_table(){
	return self::setPrefix().'table_name';
}

public static function getAll()
{
    echo $cont = self::service_table();
    return DB::select("select * from $cont where avail = 1");
}

}

[php]