RE: [PHP] Else/For loop
> Being relatively new to php, I discovered the following
> after about 2 hours of debugging last night and was wondering why???
>
> I had the following code:
>
> if ( $num_results = 0 )
> {
> echo "no records found";
> }
> else
> {
> for ($i=0; $i < $num_results; $i++)
> {
> display record set
> }
> }
> The duduction...for loops will not work inside else
> statements. The question...why?
Your deduction is wrong, they do. If this is the code that you're
actually using then I suspect that your problem is more in the
conditional you've got in your 'if' statement. You aren't doing a
compare you're actually setting $num_results to 0. A comparison is '=='
rather than just '.
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RE: [PHP] Else/For loop
Thanks to everyone who replied. Of course it should be '=='. I was too
focused on why the for was not working and overlooked the obvious.
Mark Roberts
Sr. Systems Analyst
LanApps/Web Development
The Williams Information Services Corporation
918-573-1706
[EMAIL PROTECTED]
-Original Message-
From: Christoph Starkmann [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, June 12, 2002 8:27 AM
To: Roberts, Mark; '[EMAIL PROTECTED]'
Subject: RE: [PHP] Else/For loop
Hi Mark!
> Being relatively new to php, I discovered the following after
> about 2 hours
> of debugging last night and was wondering why???
>
> I had the following code:
>
> if ( $num_results = 0 )
> {
> echo "no records found";
> }
> else
> {
> for ($i=0; $i < $num_results; $i++)
> {
> display record set
> }
> }
>
> As a result, the for loop never executed, no matter how many
> records were
> returned in the record set. I placed echo statements though
> out to determine
> why the for loop was not being executed. I put an echo
> statement just before
> the for to make sure the else condition was being met.
>
> Finally, I just copy/pasted (literally) the for loop to just
> before the 'if'
> statement. Much to my surprise...the for loop now works
> perfectly. (Except,
> of course, if there are no records returned).
>
> The duduction...for loops will not work inside else statements. The
> question...why?
I guess this would be the end of all PHP-programming ;)
Of course you can place any correct block of code inside any other
correct block of code.
But, i your case $num_results IS zero. Just place an echo statement
inside the if block ;)
Very frequent error ;)
"if ($num_results = 0)" indeed is an asignment, no comparison.
Better use "==" if you want to compare thingies...
> I think I can work around this with some different coding,
> but why should I
> have to? I have done this same thing in java, perl and other
> languages...
Yes, also with "==" ;)
Cheers,
Kiko
--
It's not a bug, it's a feature.
christoph starkmann
mailto:[EMAIL PROTECTED]
http://www.gruppe-69.com/
ICQ: 100601600
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RE: [PHP] Else/For loop
Hi Mark!
> Being relatively new to php, I discovered the following after
> about 2 hours
> of debugging last night and was wondering why???
>
> I had the following code:
>
> if ( $num_results = 0 )
> {
> echo "no records found";
> }
> else
> {
> for ($i=0; $i < $num_results; $i++)
> {
> display record set
> }
> }
>
> As a result, the for loop never executed, no matter how many
> records were
> returned in the record set. I placed echo statements though
> out to determine
> why the for loop was not being executed. I put an echo
> statement just before
> the for to make sure the else condition was being met.
>
> Finally, I just copy/pasted (literally) the for loop to just
> before the 'if'
> statement. Much to my surprise...the for loop now works
> perfectly. (Except,
> of course, if there are no records returned).
>
> The duduction...for loops will not work inside else statements. The
> question...why?
I guess this would be the end of all PHP-programming ;)
Of course you can place any correct block of code inside any other
correct block of code.
But, i your case $num_results IS zero. Just place an echo statement
inside the if block ;)
Very frequent error ;)
"if ($num_results = 0)" indeed is an asignment, no comparison.
Better use "==" if you want to compare thingies...
> I think I can work around this with some different coding,
> but why should I
> have to? I have done this same thing in java, perl and other
> languages...
Yes, also with "==" ;)
Cheers,
Kiko
--
It's not a bug, it's a feature.
christoph starkmann
mailto:[EMAIL PROTECTED]
http://www.gruppe-69.com/
ICQ: 100601600
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RE: [PHP] Else/For loop
If you still have an error there, change
if ($num_results = 0)
to
if ($num_results == 0)
See the difference? Realize the error?
Niklas
-Original Message-
From: Roberts, Mark [mailto:[EMAIL PROTECTED]]
Sent: 12. kesäkuuta 2002 16:20
To: [EMAIL PROTECTED]
Subject: [PHP] Else/For loop
Being relatively new to php, I discovered the following after about 2
hours of debugging last night and was wondering why???
I had the following code:
if ( $num_results = 0 )
{
echo "no records found";
}
else
{
for ($i=0; $i < $num_results; $i++)
{
display record set
}
}
As a result, the for loop never executed, no matter how many records
were returned in the record set. I placed echo statements though out to
determine why the for loop was not being executed. I put an echo
statement just before the for to make sure the else condition was being
met.
Finally, I just copy/pasted (literally) the for loop to just before the
'if' statement. Much to my surprise...the for loop now works perfectly.
(Except, of course, if there are no records returned).
The duduction...for loops will not work inside else statements. The
question...why?
I think I can work around this with some different coding, but why
should I have to? I have done this same thing in java, perl and other
languages...
Mark Roberts
Sr. Systems Analyst
LanApps/Web Development
The Williams Information Services Corporation
918-573-1706
[EMAIL PROTECTED]
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Re: [PHP] Else/For loop
Wouldn't you need
if ( $num_results == 0 ) not
if ( $num_results = 0 )
if you do the latter, it will allways be true, because you're setting the
var...
easy mistake to make!
check out comparisons in the manual for more info.
Justin French
on 12/06/02 11:19 PM, Roberts, Mark ([EMAIL PROTECTED]) wrote:
> Being relatively new to php, I discovered the following after about 2 hours
> of debugging last night and was wondering why???
>
> I had the following code:
>
> if ( $num_results = 0 )
> {
> echo "no records found";
> }
> else
> {
> for ($i=0; $i < $num_results; $i++)
> {
> display record set
> }
> }
>
> As a result, the for loop never executed, no matter how many records were
> returned in the record set. I placed echo statements though out to determine
> why the for loop was not being executed. I put an echo statement just before
> the for to make sure the else condition was being met.
>
> Finally, I just copy/pasted (literally) the for loop to just before the 'if'
> statement. Much to my surprise...the for loop now works perfectly. (Except,
> of course, if there are no records returned).
>
> The duduction...for loops will not work inside else statements. The
> question...why?
>
> I think I can work around this with some different coding, but why should I
> have to? I have done this same thing in java, perl and other languages...
>
> Mark Roberts
> Sr. Systems Analyst
> LanApps/Web Development
> The Williams Information Services Corporation
> 918-573-1706
> [EMAIL PROTECTED]
>
>
>
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