remove same values from an array

Question

I have an array like this

Array
(
    [0] => u1,u2
    [1] => u2,u1
    [2] => u4,u3
    [3] => u1,u3
    [4] => u1,u2
)

I want to remove similar values from the array I want an out put like

Array
    (
        [0] => u1,u2
        [1] => u4,u3
        [2] => u1,u3

    )

I tried to loop thru the input array, sort the value of the indexes alphabetically and then tried array_search to find the repeated values. but never really got the desired output

any help apprecated

@RoyalBg: since array_unique was not working i tried all these steps.It will not work — zamil, Aug 27 '13 at 10:40
As I have said in the comments to the answers, none of them will work since `u1,u2 !== u2,u1`. `array_unique` matches exact values only. — BenM, Aug 27 '13 at 10:40
Tried exploding the pairs in another arrays and compare the unique? — Royal Bg, Aug 27 '13 at 10:41

score 3 · Accepted Answer · answered Aug 27 '13 at 10:48

3

You cannot use array_unique() alone, since this will only match exact duplicates only. As a result, you'll have to loop over and check each permutation of that value.

You can use array_unique() to begin with, and then loop over:

$myArray = array('u1,u2', 'u2,u1', 'u4,u3', 'u1,u3', 'u1,u2');

$newArr = array_unique($myArray);
$holderArr = array();

foreach($newArr as $val)
{
    $parts = explode(',', $val);
    $part1 = $parts[0].','.$parts[1];
    $part2 = $parts[1].','.$parts[0];

    if(!in_array($part1, $holderArr) && !in_array($part2, $holderArr))
    {
        $holderArr[] = $val;
    }
}

$newArr = $holderArr;

The above code will produce the following output:

Array ( 
    [0] => u1,u2 
    [1] => u4,u3 
    [2] => u1,u3 
)

answered Aug 27 '13 at 10:48

BenM

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This solves my problem. Thanks a lot Ben :). Thanks to all who tried to solve this. – zamil Aug 27 '13 at 10:52
Thought it was the decision :) +1 for the whole answer. – Royal Bg Aug 27 '13 at 10:52
1

Glad to help. A note to the others, it sometimes helps to read the whole question :) – BenM Aug 27 '13 at 10:54

score 0 · Answer 2 · answered Aug 27 '13 at 10:36

0

Use array_unique() PHP function:

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

answered Aug 27 '13 at 10:36

Lkopo

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I don't think `array_unique` will work here, since `u1,u2 !== u2,u1`. – BenM Aug 27 '13 at 10:39
" want to remove similar values" u1,u2 !== u2,u1 -> they are not similar i think. – Lkopo Aug 27 '13 at 10:40
1

See the desired output. `unique` != `similar`. – BenM Aug 27 '13 at 10:41

score 0 · Answer 3 · answered Aug 27 '13 at 10:36

0

Use the function array_unique($array)

answered Aug 27 '13 at 10:36

Leo T Abraham

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score 0 · Answer 4 · answered Aug 27 '13 at 10:36

0

array array_unique ( array $array [, int $sort_flags = SORT_STRING ] )

php manual

answered Aug 27 '13 at 10:36

Bhavin Rana

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I don't think `array_unique` will work here, since `u1,u2 !== u2,u1`. – BenM Aug 27 '13 at 10:40

rAjA · Answer 5 · 2013-08-27T11:00:18.417

0

since u1,u2 !== u2,u1

    $array=array('u1,u2','u2,u1','u4,u3','u1,u3','u1,u2');
    foreach($array as $k=>$v)
    {
        $sub_arr = explode(',',$v);
        asort($sub_arr);
        $array[$k] = implode(',',$sub_arr);
    }

    $unique_array = array_unique($array);

    //$unique_array = array_values($unique_array) //if you want to preserve the ordered keys

edited Aug 27 '13 at 11:00

answered Aug 27 '13 at 10:45

rAjA

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remove same values from an array

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