Re: I need help - Newbie stuck ( php check form input )
- From: macca <ptmcnally@xxxxxxxxxxxxxx>
- Date: Thu, 23 Jul 2009 01:56:29 -0700 (PDT)
On Jul 23, 8:49 am, transpar3nt <caspergho...@xxxxxxxxx> wrote:
On Jul 22, 7:04 am, Peter <pete.ivesAll_stR...@xxxxxxxxxxxxxxxx>
wrote:
In article <451566ee-2a23-4eee-b05d-
fd3f02e38...@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>, ptmcna...@xxxxxxxxxxxxxx
says...
I stand corrected. Of course a single space would pass the test.
However, even with trim() any single character would also pass the
test and is unlikely to be the correct input. I agree further
validation of the data before insert into a database would be a very
good idea, but for flow control the methodology is sound.
Besides, wouldn't the data provided by the user then be compared to
known user_ids or usernames in the database and then, if found to be
incorrect, the user would be told to re-enter either username or id
again. So does it make a difference if any leading spaces were
accidentally included to this working correctly?
--
Pete Ives
Remove All_stRESS before sending me an email
It does matter because if you allow that extra space but the user
doesn't realize they put it there upon signup, they may never be able
to directly retrieve the username again (assuming it will be used to
log in with an exact match to the database, which should be good
practice).
One side-note, if you are needing to validate just an integer input
(such as for the user ID) and make it safe in the database at the same
time, I use intval to check it... e.g.
$user_id = intval($_POST['user_id']);
if ($user_id > 0) {
[here it's safe to enter into the DB]
}
If the user entered a string then intval will give it a value of 0
So as long as that value is greater than 0 then you know they entered
an integer, all you need from there is to validate it to existing db
values... etc.
Anyone have comment as to if this is good practice (or am I missing
something big here?)
- Keith Wolf
Have you seen the function is_numeric() This may also be useful.
.
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