Problem with Arrays

CoryMathews · 02-26-2008, 02:24 PM

Im having a small problem with arrays, this code used to work, but now i get something like

Code:

Notice: Undefined offset: 1 on line 69

Notice: Undefined offset: 2 on line 77

Notice: Undefined offset: 3 on line 85

you can view the errors here

Heres the code, in short it gets the categories from the db, and splits them into 4 columns. Im pretty sure the error is because im trying to pull from an empty array. The errors only occur when the amount of categories are not directly divisable by 4.

Wildhoney · 02-26-2008, 04:17 PM

That's a crazy bit of PHP code. What the hell is going on?

And why are you doing it like that? And what does it achieve?

CoryMathews · 02-26-2008, 07:42 PM

lol it takes a list of categories returned from a db query. Then i am arranging it in 4 columns. But i want them in alpha order going down instead of across. So i had to come up with this crazy work around. I couldnt figure out another way to do it.

But the problem is when it trys to push on an empty value on these lines

Code:

for ($x=0;$x<$tot_rows;$x++) { array_push($byFours1, $subs[$y]); $y++; }

there is nothing left in $subs[] to add. I have tried isset, i have tried seeing if $y is higher then the number of rows returned but still no luck.

I hope thats a little more clear.

TlcAndres · 02-26-2008, 09:13 PM

Do you have your server set to E_STRICT? and ++$var us faster then then $var++

ReSpawN · 02-26-2008, 09:53 PM

Like TlcAndress just said, maybe you should try using error_reporting( E_ALL ^ E_NOTICE ); for your debugging.

So, what you want to do is retrieve a 1D (one dimensional array as we call it at work) and filter every value depending on the row name. For example;

PHP Code:


			
$queryFinal = $queryRow[['fieldcat']['fieldname']] = $queryRow['queryvalue'];

If I am right, this is what you are trying to accomplish?

Else, from another perspective, you want to sort every value? Or push it into 4 different arrays?
You should take a look at PHP: Arrays - Manual. That might solve some of your issues. I advise you to read them carefully since I use a lot of them for different tasks.

I hope this helps.

xenon · 02-26-2008, 11:47 PM

Use a query to fetch the data already ordered, put all that data into one big array, then use array_slice to "cut" the big array into 4 pieces...this is a less trickier way to achieve what I believe you want to achieve. There are other ways, but I'm too tired to come up with a more efficient solution right now...

CoryMathews · 02-27-2008, 02:04 PM

Well i finally figured it out. I ended up just adding '' to the array if there were not any more values to add. Thanks for the suggestions though.