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I believe I found an error in the digital online copy. It is in Chapter 2 under "Handling an HTML Form". Paragraph 3 reads: PHP is case-sensitive when it comes to variable names, so $_REQUEST[‘city’] will work, but $_REQUEST[‘city’] and $_REQUEST[‘city’] will have no value. I'm not seeing any difference in the three variable names. I believe this sentence needs to be fixed.
Line 6 of Script 2.4 is missing an end quote: 6 <style type="text/css> should be 6 <style type="text/css">