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Posted by Erwin Moller on 08/26/05 16:32
Karin Jensen wrote:
> Erwin Moller wrote:
>>Karin Jensen wrote:
>>> Hi
>>> I am running a PHP program that connects to an Access 2000
>>> database via ODBC:
>>> $results = odbc_exec($connection_id, $sql_select);
>>> Is it possible to sort the contents of $results? I wish to use a
>>> regex-based sort order that you can't do in Access 2000* SQL
>>> with "ORDER BY".
>>
>> Hi,
>>
>> PHP is so friendly, you can write your own comparision-functions,
>> which you can let PHP call to define how to sort.
>> :-)
>>
>> Have a look at usort
>> http://nl2.php.net/usort
>>
>> See also uasort(), uksort().
>
> Thanks, Erwin! Sorry to ask more, but the question I was getting at
> was whether (in my example) $results would have to be dealt with in
> a special way, as it is from an ODBC function.
>
> I am new to PHP and not sure what sort of object $results is or how
> to find out what sort of object it is.
Hi,
Yes, your $result is a special case: it is a 'resource'.
I wouldn't be surprised if you could treat it like an array after some
fiddling around, but I do not know.
Safest bet is to copy all the rows to your own array-structure, then use
that structure to do the sorting.
But a fair warning, if you have little experience with PHP and arrays in
PHP, you better take a day or two to get some experience.
PHP is very powerfull when it comes to arrays, but things can get
confusing/intimidating in the beginning.
eg: Try to create your own datastructures, using strings as keys.
$myArr["userid12"]["name"] = "john";
$myArr["userid12"]["city"] = "Amsterdam";
$myArr["userid12"]["admin"] = "N";
$myArr["userid12"]["articles"][] = 21;
$myArr["userid12"]["articles"][] = 26;
$myArr["userid23"]["name"] = "Bert";
$myArr["userid23"]["city"] = "Los Angeles";
$myArr["userid23"]["admin"] = "Y";
$myArr["userid23"]["articles"][] = 17;
etc.
PHP can use the keys ("useridxx") as material to do the sorting AND keep the
underlying arrays coupled to the keys.
I (and others) find that kind of datarepresentation extremely powerfull to
use and easy to implement.
(Note: My example is a bit over the top, but illustrates the use of
associative arrays to create/store all kind of datastructures.)
Well, just read up at php.net about arrays, it is all there. :-)
Good luck.
Regards,
Erwin Moller
>
> PHP clearly knows that $results is ODBC-derived, as you have to
> extract data/info from it using special functions (odbc_fetch_row,
> odbc_result and so on). I was wondering if this affected how you
> would sort it.
>
> Many thanks,
>
> Karin
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