php claims my defined variable is undefined

Question

My php is a little rusty but this is boggling my mind right now. I googled this and read all the stackoverflow questions I could find that looked related, but those all seem

Answer 1

if you don't want to use globals, you can jast use

 function add_msg($msg)
   {
         echo  "
$msg
";
   }
    add_msg("test");
    add_msg("test2");

function, the result will be the same.