I want to store php code inside my database and then use it into my script.

class A {
    public function getName() {
        return "lux";
    }
}
// instantiates a new A
$a = new A();

Inside my database there is data like

"hello {$a->getName()}, how are you ?"

In my php code I load the data into a variable $string

$string = load_data_from_db();
echo $string; // echoes hello {$a->getName()}, how are you ?

So now $string contains "hello {$a->getName()}, how are you ?"

{$a->getName()} still being un-interpretated

Question: I can't find how to write the rest of the code so that {$a->getName()} gets interpretated "into hello lux, how are you". Can someone help ?

$new_string = ??????
echo $new_string; //echoes hello lux, how are you ?

Is there a solution with eval() ? (please no debate about evil eval ;)) Or any other solution ?