PHP - form won't pass the variable

Ok, i know this may sound super dumb. But I ran into a problem and simplied the code. I have checked it again and again and just can’t find WHY is it that doesn’t work. Please help.

I have this simple form:

<form action=“tester.php” method=“post”>
Your Name: <input type=“text” name=“firstname”>
<input type=“submit” value=“go”>
</form>

and then i have tester.php

<?php
echo (“Your name is $firstname”);
?>

Why wouldn’t it work? What am I doing wrong???

PLEASE HELP:ne:
Leo