Re: SQL Distinct-like behaviour

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I don't know what I was thinking when I wrote that actually, that is so 
blatantly obvious :)


Thanks Brian.

Hamza.


"brian" <phplist@xxxxxxxxxxxxxxx> wrote in message 
news:46CE54A3.0@xxxxxxxxxxxxxxxxxx
> Marcelo de Moraes Serpa wrote:
>> How could I iterate over the files in a directory and build a list of 
>> unique
>> filenames? Take the following filelist:
>>
>> file1_01.jpg
>> file2_01.jpg
>> file2_02.jpg
>> file2_03.jpg
>> file3_01.jpg
>> file3_02.jpg
>> file3_03.jpg
>> file4_01.jpg
>> file4_02.jpg
>> file4_03.jpg
>>
>> I would like to build an array like this: $names =
>> ("file1","file2","file3","file4")
>>
>
> As mentioned, use array_unique(). But that'll only help once you've built 
> up an array of filenames (after trimming off the last bit). I think Jay & 
> Hamza missed the fact that the files are *already unique*. One would be 
> hard-pressed to store multiple files with the same name in a directory.
>
> So, i'm assuming your filenames wil be more like:
>
> foo_01.jpg
> foo_02.jpg
> bar_01.jpg
>
> etc. IOW, you want to perform a regexp such that you isolate the last part 
> to remove it before shuffling out the dupes. So:
>
> $filenames = Array('foo_01.jpg', 'foo_02.jpg', 'bar_01.jpg', 'baz_01.jpg', 
> 'bar_02.jpg');
>
> $out = array_unique(preg_replace('/^([a-z]+)_[0-9]+\.jpg$/', '$1', 
> $filenames));
>
> var_dump($out);
>
> --snip--
> array(3) {
>   [0]=>  string(3) "foo"
>   [2]=>  string(3) "bar"
>   [3]=>  string(3) "baz"
> }
> --snip--
>
> Note that if you might have uppercase letters, dashes, underscores, etc. 
> in the filename you'll need to modify that a bit. Something like:
>
> '/^([a-zA-Z-_]+)_[0-9]+\.jpg$/'
>
> If you'll have more than one file extension, replace 'jpg' with '[a-z]+'
>
> However, the array_unique call will cause, eg. both 'bar_01.jpg' and 
> 'bar_01.png' to output 'bar' only once, which may not be what you want.
>
> HTH,
> brian 

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