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Posted by Marcus Bointon on 10/31/05 18:33
On 31 Oct 2005, at 14:54, Chris Shiflett wrote:
> Hopefully it is also clear that your argument revolves around the
> idea that PHP would create $_POST['foo'] as NULL if the checkbox is
> not checked. This is wrong for two reasons:
No, no, that's not what I said - I wouldn't contemplate such
silliness! The thing I was wrong on is that PHP converts unset
parameters (as opposed to nonexistent ones which it obviously can't
do anything about) to an empty string, e.g. given ?a=&b=1, $_REQUEST
['a'] is "", not NULL. However, it still serves to underline my other
point that using isset without actually knowing that is a potentially
dangerous thing. Getting into the habit of using it for looking in
the likes of $_REQUEST means you're likely to use it other places
where you have no such guarantee, and you'll have a bug to track
down. Using array_key_exists means you will never be exposed to this
possibility, no matter where your data comes from.
Marcus
--
Marcus Bointon
Synchromedia Limited: Putting you in the picture
marcus@synchromedia.co.uk | http://www.synchromedia.co.uk
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