PHP - remove index with duplicated values

Question

I have an 2D array, it is simple as this:

[0] => Array
    (
        [0] => 6
        [1] => 6
        [2] => 6
    )

[1] => Array
    (
        [0] => 6
        [1] => 6
        [2] => 11
    )

[2] => Array
    (
        [0] => 6
        [1] => 6
        [2] => 6
    )

Of course, they are inside of another array. What I want is to remove index[2] because it has same values as index[0]. I searched here and on google but couldn't find how to solve issue exactly like this one. Thank you in advance.

Have a look at stackoverflow.com/questions/369602/… (unsetting an element in a php array) — fvu
– fvu, Commented May 8, 2013 at 23:36
Yes, but that will remove only value, I want to remove complete index. — mihajlo
– mihajlo, Commented May 8, 2013 at 23:39
@fvu In your case, first I must find duplicates and then unset them. I think there is a function that does both at the same time and I have used it but can't remember right now.. — mihajlo
– mihajlo, Commented May 8, 2013 at 23:44

clime · Accepted Answer · 2013-05-08 23:41:27Z

3

Look at array_unique with SORT_REGULAR flag.

array_unique($your_array, SORT_REGULAR);

answered May 8, 2013 at 23:41

clime

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4 Comments

clime Over a year ago

@zavg: you should use SORT_REGULAR, otherwise it performs conversion of inner arrays always producing 'Array'.

clime Over a year ago

@ItayMoav-Malimovka I think that NOTE might come from times before sort_flags added. I really don't see a reason why it should not work now if you can do array(1,2,3) === array(1,2,3).

zavg Over a year ago

@clime Ok, agree, it works cause I tested it on 2 elements array.

mihajlo Over a year ago

will try it right away - it works..I have misunderstood the function. Thank you @clime

Itay Moav -Malimovka · Accepted Answer · 2013-05-08 23:41:20Z

0

don't crare too much on performance.

$dict = array();
foreach($your_data as $one_index){
  $dict[join('',$one_index)]=$one_index;
}

$res=array();
foreach($dict as $one_index){
   $res[] = $one_index;
}

var_dump($res);

answered May 8, 2013 at 23:41

Itay Moav -Malimovka

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2 Comments

mihajlo Over a year ago

can you explain why is there another array? to comapre values or?

Itay Moav -Malimovka Over a year ago

Which one? $dict is to create a hash of the values. which allows for easy comparison.

Xeos · Accepted Answer · 2013-05-08 23:46:32Z

0

I can suggest having a hash sum calculated for every sub-array in case you have many sub-arrays with many values. Then store that hash into a new array or as an element of the sub-array. Then itterate through comparing hashes and unset($foundArray); for matches.

answered May 8, 2013 at 23:46

Xeos

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1 Comment

mihajlo Over a year ago

Array has no more than 25 'main' indexes, and I know there is a simple way (I did it before) but just can't remember.

RST · Accepted Answer · 2013-05-08 23:58:51Z

0

try this

function array_unique_recusive($arr){
foreach($arr as $key=>$value)
if(gettype($value)=='array')
    $arr[$key]=array_unique_recusive($value);
return array_unique($arr,SORT_REGULAR);
}

as mentioned here http://php.net/manual/en/function.array-unique.php

answered May 8, 2013 at 23:58

RST

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5 Comments

mihajlo Over a year ago

1. what does 'gettype' do? 2. will my original array be owerwritten?

RST Over a year ago

Well gettype will... get type of the value variable. You can store the return array of the function in a variable. $myArray=array_unique_recusive($originalArray);

mihajlo Over a year ago

that was obviously :).how to access than that variable in another loop?

RST Over a year ago

I am not sure what you mean. There is already a loop in this function.

mihajlo Over a year ago

got confused a little bit, it was 03:00AM at my place (now is 07:05 :)).

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