Uh isset will work in this particular instance because $_POST is
an array whose values are of one type and one type only: STRINGS.
Yes, it is true that:
$myArray['a'] = NULL;
isSet($myArray['a']); //Will return FALSE.
However, because $_POST contains STRINGS AND STRINGS ONLY, isSet works:
On Mon, October 31, 2005 2:53 pm, Marcus Bointon wrote:
Take apart this operation:
$a = isset($myarray['a']);
Implicit in this simple line is a 'hidden' step which is to look up
the index 'a' in $myarray to get its value before testing if it is
No.
I don't care what the value is, and
On Mon, October 31, 2005 4:56 pm, Marcus Bointon wrote:
Yesterday I encountered an error in a large commercial php script and
it turned out that it was looking in $_SERVER['SERVER_NAME'] which
was there but set to NULL for some reason, and their test with isset
was failing. So it's not just
On 11/8/05 11:38 PM, Richard Lynch wrote:
If you want to stuff NULL into something, and then use is_null() that
makes sense.
If you want to stuff NULL in there, and then use isset(), I'm not
quite sure why you'd put NULL in there in the first place, but I don't
rightly know what I'd expect
On 11/8/05 11:52 PM, Ben Ramsey wrote:
I know this is off-topic for this thread, but just as I see isset()
misused (as in this case), I often see empty() misused. For example,
when using empty(), the following all return TRUE:
On second thought, misused is the wrong word. I mean
-Original Message-
From: Chris Shiflett [mailto:[EMAIL PROTECTED]
Sent: 31 October 2005 17:19
To: Marcus Bointon
Marcus Bointon wrote:
The thing I was wrong on is that PHP converts unset parameters (as
opposed to nonexistent ones which it obviously can't do anything
about) to
On 31 Oct 2005, at 06:18, Richard Lynch wrote:
But I really do believe isset($_POST['checkbox_name']) is a good
coding practice.
OK, so PHP may not pass through unset params as NULL (it's not up to
the browser), but if you don't select any checkboxes at all, the
param won't exist, and
Marcus Bointon wrote:
OK, so PHP may not pass through unset params as NULL (it's not up to
the browser)
Well, it's certainly not up to PHP. Think about it.
Let me give you an example to try:
form action=test.php method=POST
input type=checkbox name=foo value= /
input type=submit /
/form
pre
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
On Mon, 2005-10-31 at 11:33, Marcus Bointon wrote:
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,
Marcus Bointon wrote:
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, $_REQUEST ['a'] is
, not NULL.
That's right, except we seem to have a vocabulary discrepancy:
On Mon, October 31, 2005 4:38 am, Marcus Bointon wrote:
On 31 Oct 2005, at 06:18, Richard Lynch wrote:
But I really do believe isset($_POST['checkbox_name']) is a good
coding practice.
OK, so PHP may not pass through unset params as NULL (it's not up to
the browser), but if you don't select
On Mon, October 31, 2005 10:33 am, Marcus Bointon wrote:
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,
On 31 Oct 2005, at 17:55, Richard Lynch wrote:
You're wrong.
No. You're just missing what I'm on about. I'll agree it's very dull.
isset() does not, under any circumstances, create an index nor a
variable.
Quite right; I never said it did.
Its entire purpose *IS* to tell you if something
Marcus Bointon wrote:
But that's not the question you're using isset to answer. You just
want to know if something exists - you probably don't even care
what its value is.
I think this is where some (most?) of the misunderstanding originates.
Testing to see whether something exists is exactly
On 31 Oct 2005, at 21:11, Chris Shiflett wrote:
I think this is where some (most?) of the misunderstanding
originates. Testing to see whether something exists is exactly what
isset() does.
No. Given $myarray['a'] = NULL, isset($myarray[a']) returns false.
You're saying that therefore,
Marcus Bointon wrote:
Given $myarray['a'] = NULL, isset($myarray[a']) returns false.
Yes, I think we've established that.
I'm sure Richard and I were both well aware of this fact, but just in
case we weren't, I think we can safely assume we are by now. :-)
You're saying that therefore,
On 29 Oct 2005, at 20:59, Richard Lynch wrote:
So you will most likely be using isset($_POST['checkbox_name']) rather
than testing for on
I classify using isset for checking for the existence of array keys
to be a bad habit as in some common cases it will not work as you
expect, for
On Sun, October 30, 2005 5:52 am, Marcus Bointon wrote:
On 29 Oct 2005, at 20:59, Richard Lynch wrote:
So you will most likely be using isset($_POST['checkbox_name'])
rather
than testing for on
I classify using isset for checking for the existence of array keys
to be a bad habit as in some
On Fri, October 28, 2005 10:00 am, Shaun wrote:
I have some checkboxes on my page which correspond with boolean fields
in my
database - actually they are TINYINT's in which I store a 0 or 1 in
for
false and true values respectively.
Is it possible to loop through all $_POST values to see if
Hi,
I have some checkboxes on my page which correspond with boolean fields in my
database - actually they are TINYINT's in which I store a 0 or 1 in for
false and true values respectively.
Is it possible to loop through all $_POST values to see if it is a checkbox?
If so then for that element
Hello Shaun,
Friday, October 28, 2005, 9:00:05 AM, you wrote:
Is it possible to loop through all $_POST values to see if it is a
checkbox? If so then for that element if it is equal to 'on' then
change it to 1 otherwise change it to 0?
Yes and no.
1. You can't determine by the POST variable
Is it possible to loop through all $_POST values to see if it
is a checkbox?
If so then for that element if it is equal to 'on' then
change it to 1
otherwise change it to 0?
foreach($_POST as $key = $value){
if
[snip]
I have some checkboxes on my page which correspond with boolean fields in my
database - actually they are TINYINT's in which I store a 0 or 1 in for
false and true values respectively.
Is it possible to loop through all $_POST values to see if it is a checkbox?
If so then for that
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