[PHP] evaluating dynamic variable
Hi,
I'm having trouble evaluating a dynamic variable. I want to check if the
variable $_POST[resolutions$i] is an empty string, as you'll see from the
code. However, every way I've tried to check the variable so far (including
empty() and eval()) always returns a null value, even when the variable
should contain a value. I've probably been doing something wrong in my
previous efforts. Can someone recommend a way to reliably evaluate this
variable?
for ($i=1; $i=$entries; $i++) {
if($_POST[resolutions$i] !== ''){
do_something();
}
}
Thanks.
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RE: [PHP] evaluating dynamic variable
[snip]
I'm having trouble evaluating a dynamic variable. I want to check if the
variable $_POST[resolutions$i] is an empty string, as you'll see from
the
code. However, every way I've tried to check the variable so far
(including
empty() and eval()) always returns a null value, even when the variable
should contain a value. I've probably been doing something wrong in my
previous efforts. Can someone recommend a way to reliably evaluate this
variable?
for ($i=1; $i=$entries; $i++) {
if($_POST[resolutions$i] !== ''){
do_something();
}
}
[/snip]
Well, I tried this
/*
** submit form (res1.php)
*/
form action=res2.php method=POST
input type=text name=resolution1
input type=text name=resolution2
input type=submit
/form
/*
** process (res2.php)
*/
?php
$entries = count($_POST);
for ($i=1; $i=$entries; $i++) {
if($_POST[resolutions$i] !== ''){
print($_POST[resolution$i]);
}
}
?
And I had no problems.
HTH!
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Re: [PHP] evaluating dynamic variable
this worked for me.
?
$entries = 20;
for ($i=1; $i=$entries; $i++) {
if(isset($_POST[resolutions$i]) $_POST[resolutions$i] !==
''){
echo Hello $ibr /;
}
}
?
html
body
form method=POST
input type=hidden name=resolutions1 value=etefgtE /
input type=hidden name=resolutions3 value=etefgtE /
input type=hidden name=resolutions5 value=etefgtE /
input type=hidden name=resolutions6 value=etefgtE /
input type=hidden name=resolutions15 value=etefgtE /
input type=hidden name=resolutions12 value= /
input type=submit name=submit /
/form
/body
/html
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RE: [PHP] evaluating dynamic variable
Steve Goodman mailto:[EMAIL PROTECTED]
on Tuesday, September 02, 2003 12:54 PM said:
Can someone
recommend a way to reliably evaluate this variable?
1. (not positive on this point so correct me if I'm wrong) you shouldn't
compare with !==. Instead us !=.
2. What does the following do?
for ($i=1; $i=$entries; $i++)
{
if(empty($_POST[resolutions.$i]))
{
echo empty!;
}
else
{
echo not empty!
}
}
You might also like to try isset() along with empty().
hth,
Chris.
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RE: [PHP] evaluating dynamic variable
Chris W. Parker on Tuesday, September 02, 2003 1:29 PM said: 1. (not positive on this point so correct me if I'm wrong) you shouldn't compare with !==. Instead us !=. Ok, turns out I'm wrong on that. I guess I should go look it up!! -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
RE: [PHP] evaluating dynamic variable
When I run the code you've attached, with $i iterating up to 3, I get
three 'empty!', even if $resolution1 should be 'not empty!'. It seems
like the $i in $_POST[resolutions.$i] is not getting parsed into a
value, and php is looking for a key resolutions$i.
Whoops, I'm an idiot. Resolution singular, not plural. Thanks for the
help everyone
.
-Original Message-
From: Chris W. Parker [mailto:[EMAIL PROTECTED]
Sent: Tuesday, September 02, 2003 3:29 PM
To: Stephen Goodman; [EMAIL PROTECTED]
Subject: RE: [PHP] evaluating dynamic variable
Steve Goodman mailto:[EMAIL PROTECTED]
on Tuesday, September 02, 2003 12:54 PM said:
Can someone
recommend a way to reliably evaluate this variable?
1. (not positive on this point so correct me if I'm wrong) you shouldn't
compare with !==. Instead us !=.
2. What does the following do?
for ($i=1; $i=$entries; $i++)
{
if(empty($_POST[resolutions.$i]))
{
echo empty!;
}
else
{
echo not empty!
}
}
You might also like to try isset() along with empty().
hth,
Chris.
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Re: [PHP] evaluating dynamic variable
From: Stephen Goodman [EMAIL PROTECTED] When I run the code you've attached, with $i iterating up to 3, I get three 'empty!', even if $resolution1 should be 'not empty!'. It seems like the $i in $_POST[resolutions.$i] is not getting parsed into a value, and php is looking for a key resolutions$i. Whoops, I'm an idiot. Resolution singular, not plural. Thanks for the help everyone Does that mean you solved it? Remember that PHP is case sensitive, too. $_POST['Resolution'] is not the same as $_POST['resolution']. If you're still having trouble, go back to some basic debugging. Do a print_r($_POST) so you actually know what $_POST contains, to begin with. ---John Holmes... -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
