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if(isset($_GET['w'])&&$_GET['w']>=0&&$_GET['w']<=65)
when $_GET['w'] has a value of (for example) ccc the condition becomes true whereas it should only accepts numbers from and including 0 to and including 65
“ccc” == 0 is true.
You should also check whether it is a number before comparing $_GET[…] parameters this way.
isnumeric() if I’m correct.
There are other tests you can use to check whether it’s a decimal number. For example, you could run a
preg_match('/^[0-9]+$/', $_GET['w']) == 1.