Array_unique

Array_unique
I have a directory of files with filenames such as 20070704_A_01.pdf, 20070704_B_03.pdf, etc.

I am trying to get the letter, such as A and B, exploded out of the filename. There will be several instances of the same letter, such as 5 letter A's and 6 letter B's, etc.

I want to get a unique list of all of the letters. But when I use array_unique, it does not recognize that there are multiple instances of the same letter. The array still looks like: Code:

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I Want To Do Array_unique BUT IN REVERSE!
hello everyone. This is a simple problem I think, but I can't work it out.

Usually you need to get unique values from an array, but I actually sort of want to do the opposite to that.

I need to get all the values from an array that appear more than once, and discard the rest, so like:

(orange, banana, strawberry, strawberry, orange, pineapple, orange, orange)

becomes

(orange, strawberry)

Any ideas how I would do that?

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Array_unique Is Creating A NULL Array?
I'm writting a find and replace script for my sites internal search. Basically it is for the creation of a list of keywords that can later be fed through the search (kinda an advanced search of sorts)...

Anyways, I've rewritten the function several times, and I think I am getting close, but there is one last snag.

I am using array_unique() to remove the duplicates that are created by the function, and it is reutrning NULL. What's the deal?


function findreplace() {
extract($GLOBALS);
if ($hold == 1) { return trim(stripslashes($keywords)); }
$find = strtolower($_POST['find']);
$replace = strtolower($_POST['replace']);
$keywords = trim(strtolower($keywords));

//if ($_POST['replace_words'] == "Replace Words") { ....

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Implode, Keyword Distinct, And Array_unique?
I have an array of values for subcatid (1,2,3,4,5) called $subcatidarray I have a table called sf_subcategory where each row has the following columns, subcatid, catid, and name.

I want to use each value in $subcatidarray to select the catid for that record and then I want to eliminate duplicate values (because subcatid's may share the same catids) then use the array of resulting (non-duplicate) catids to select name from a second table called sf_categories.

I think I want to use either Distinct or the function array_unique but I'm stumped how to do this. this is what I've done so far, trying the DISTINCT keyword

<?php
$str = implode(",",$subcatidarray);
$sql="SELECT DISTINCT catid";
$sql .="FROM $pntable[sf_subcategory] WHERE subcatid IN ($str)";
$result = mysql_query($sql);

$str2 = implode (",",$result);
$sql="SELECT name";
$sql .="FROM $pntable[sf_categories] WHERE catid IN ($str2)";
$result2=mysql_query($sql); ?>

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Array_unique - How-to Get First Item Value In Repeated Array Item
I would like to know how-to get the first value of repeated items too in an array using something like array_unique. Code:

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