我如何用PHP中的变量做到这一点？

$name = "Shaab";
$age = 12;
echo $name."is".$age."years old";

It's output is

Shaab is 12years old

But i don't want to display it as above. I want to store this to another variable. Like

result= Shaab is 12years old

How can I do this?

Your question already have the answer.

$result =  $name."is".$age."years old";

echo $result;