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Line 4 is:

but I don’t think that is the error, apart from the fact that href is NOT a proper URL. (can’t have spaces)

This is where your error occurs:
< ?php // line 1
// line 2
$value=$_GET['valoare']; // line 3
// line 4: error: valoare is undefined!
?>
You have nothing in any of the code above that creates a GET (no form).
Hence, $_GET will never be set, hence, $_GET['valoare'] will never be set either, hence “Undefined index”…
You should have, somewhere, a “

Your coding is very sloppy and badly organised. You are heading for serious problems if you do not improve.