Array re-sorting

fengqysll

I have a array as below:

$array = array(
array(0,0),
array(0,1),
array(0,1),
array(0,1),
array(2,2),
array(3,4),
array(1,0),
array(1,0),
array(4,3),
array(2,3),
array(2,2),
array(3,2)
);

After I have used the code below:

foreach($kkk as $kkk)
{
$final1[] = $kkk[0].' - '.$kkk[1];
}
$result1 = array_count_values($final1);

I have got this new array $final1 below:

Array
(
[0 - 0] => 1
[0 - 1] => 3
[1 - 0] => 2
[2 - 2] => 2
[2 - 3] => 1
[3 - 2] => 1
[3 - 4] => 1
[4 - 3] => 1
)

however, I would like to have the array looks like the one below:

Array
(
[0 - 0] => 1
[0 - 1] => 5
[2 - 2] => 2
[2 - 3] => 2
[3 - 4] => 2
)

because 0 -1 and 1 - 0 are the same results, same as the 2 - 3 and 3 - 2.

thanks for your help!

hiflyerx

look into :array_unique

I have used it for a simple array, not 2d, but there should be examples 🙂

nrg_alpha

While I don't have the time right now to look into this in more detail, one thing that immediately stands out:

foreach($kkk as $kkk)

$kkk is not declared in your sample. You are supposed to use an array name as the first argument in foreach, and an alias for their keys and / or values as the second..

example format:

foreach($arr as $val){
    // do something
}

So in that above example, you are plugging an array named $arr and individual key values represented by $val. But since $kkk is not defined, your entire foreach loop is rendered null and void. You should test you code and see what errors are being reported, as you should definitely get something like 'Notice: Undefined variable: kkk in .... ' (unless of course, there is more to this code and $kkk is defined, but this would still be pointless as you are interested in the array named $array, not $kkk).

fengqysll

Hi nrg_alpha:

thanks for that, you are right, actually the $kkk is the array at the beginning, cheers

nrg_alpha

If you are referring to this one:

$array = array(
array(0,0),
array(0,1),
array(0,1),
array(0,1),
array(2,2),
array(3,4),
array(1,0),
array(1,0),
array(4,3),
array(2,3),
array(2,2),
array(3,2)
);

that array is called $array, not $kkk. So using correct array names in functions like foreach is important.

Weedpacket

nrg_alpha wrote:
So using correct array names in functions like foreach is important.

Using variable names that mean something is important everywhere: the computer doesn't care what you name your variables, but it doesn't have to read them - you do.

$array? $final1? $result1? $kkk?! What's that supposed to mean?

nrg_alpha

Agreed. Variable names in their own right should definitely be useful in telling the programmer what it represents.

Side note: $kkk sounds like this variable might be racist.

Horizon88

Well, foreach ($kkk as $kkk) would trash your array, unless I'm much mistaken. 😐 It'd take the first element of $kkk, $kkk[0], and assign it back to $kkk, so you'd effectively hose all your data.

I didn't read the thread carefully, though, so maybe that was just example code.

Edit: on second thought, it'd assign the last element into $kkk, it looks like. So while you're probably getting the expected foreach() results, it's still not really good practice to do that. :/