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Posted by Jesse Guardiani on 01/10/06 21:36
Rodolfo Andrade wrote:
> 22k * 22 k = 484 millions...
> that's really a lot of data and should take a lot of time and processing
> power.
>
> I don't think it's really a bug.
>
Yeah, I guess not. I guess ~500,000 records/sec isn't so terrible.
Is there a more efficient way to difference large sets of data?
> Regards,
> Rodolfo Andrade
>
> ----- Original Message -----
> From: Jesse Guardiani
> To: php-general@lists.php.net
> Sent: Tuesday, January 10, 2006 5:07 PM
> Subject: [PHP] problem with large arrays in php 4.3.2
>
>
> Hello,
>
> I have an old version of php (4.3.2) that is acting rather strangely. I'm
> searching two large arrays (approx 22,000 records in each) using
> array_diff_key() from the PEAR PHP_Compat library:
>
> $result = $args[0];
> foreach ($args[0] as $key1 => $value1) {
> for ($i = 1; $i !== $array_count; $i++) {
> foreach ($args[$i] as $key2 => $value2) {
> if ((string) $key1 === (string) $key2) {
> unset($result[$key2]);
> break 2;
> }
> }
> }
> }
>
> And I'm getting aweful performance. I know it's a ton of records (22,000 *
> 22,000), but it shouldn't take 16 minutes on a P4 Xeon 2.4ghz!
>
> Has anyone seen this before? Is this a bug? Or are my math skills lacking
> and
> this is perfectly normal performance for the size of the data set?
>
> Thanks!
>
>
--
Jesse Guardiani
Programmer/Sys Admin
jesse@wingnet.net
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