Find the difference from two arrays in php

Question

--$arr1----

Array
    (
        [0] => Array
            (
                [id] => 1
                [Name] => AAA
            )

        [1] => Array
            (
                [id] => 6
                [Name] => BBB
            )

    )

--$arr2---

Array
(
    [0] => Array
        (
            [id] => 1
            [Name] => AAA
        )

    [1] => Array
        (
            [id] => 6
            [Name] => BBB
        )

    [2] => Array
        (
            [id] => 46
            [Name] => CCC
        )

)

I would like the final result as following. Is there anyone can help me?

--Final Result--

Array
(
    [0] => Array
        (
            [id] => 46
            [Name] => CCC
        )

)

UPDATE---

In this case, the result of array_diff($arr1,$arr2) is empty.

in PHP document is wrote: array_diff"This function only checks one dimension of a n-dimensional array" — MRM, Feb 14 '12 at 14:04
There are examples in the comments on the array_diff() page of the php docs of mult-dimensional array versions — Mark Baker, Feb 14 '12 at 14:09

Wh1T3h4Ck5 · Answer 1 · 2012-02-14T14:25:14.170

4

The easiest way is Mark Baker's solution or just write your own simple function:

Code:

function arrdiff($a1, $a2) {
  $res = array();
  foreach($a2 as $a) if (array_search($a, $a1) === false) $res[] = $a;
  return $res;
  }

print_r(arrdiff($arr1, $arr2));

Output:

Array
(
  [0] => Array
    (
      [id] => 46
      [name] => CCC
    )
)

edited Feb 14 '12 at 14:25

answered Feb 14 '12 at 14:13

Wh1T3h4Ck5

8,399
9
59
79

Mark Baker · Answer 2 · 2012-02-14T14:49:53.580

$arr1 = array(array('id' => 1,  'Name' => 'AAA'),
              array('id' => 6,  'Name' => 'BBB')
             );

$arr2 = array(array('id' => 1,  'Name' => 'AAA'),
              array('id' => 6,  'Name' => 'BBB'),
              array('id' => 46, 'Name' => 'CCC')
             );
$results = array_diff(array_map('serialize',$arr2),array_map('serialize',$arr1));
$results = array_map('unserialize',$results);

var_dump($results);

EDIT

And just for the sheer fun of it, you could use array_filter() instead of array_diff() - which means no need to serialize anything at all

$results = array_filter($arr2, function ($value) use($arr1) { return !in_array($value,$arr1); } );

var_dump($results);

Vyktor · Answer 3 · 2012-02-14T14:11:18.117

1

You should use array_diff():

$finalResult = array_diff($arr2, $arr1);

If you need more complex comparison you may also build foreach loop and use like this:

function compareItems( $a, $b){
    return $a['id'] == $b['id']; // Example compare criteria
}

$result = array();
foreach( $arr1 as $item){
    foreach( $arr2 as $key => $it){
        if( !compareItems( $item, $it)){
             $result[] = $it; // Either build new array
             unset( $arr2[$key]); // Or remove items from original array
             break;
        }
    }
}

And than you'll probably want to implement the same with reversed order of $arr1 and $arr2.

edited Feb 14 '12 at 14:11

answered Feb 14 '12 at 14:01

Vyktor

20,559
6
64
96

I used array_diff($arr1, $arr2); however, the result is empty – Acubi Feb 14 '12 at 14:03
1

As written by "the frox": http://www.php.net/manual/en/function.array-diff.php#98680 (that'll work, cause you're using multi-dimensional arrays) – Robbietjuh Feb 14 '12 at 14:11
@Acubi so try example that I've added. – Vyktor Feb 14 '12 at 14:12

score 0 · Answer 4 · edited Oct 05 '12 at 07:37

0

$arrDif=array();

$i=0;
foreach($arr1 as $value)
{
    if(!in_array($value, $arr2))
    {
        $arrDif[$i]=$value;
        $i++;
    }
}

edited Oct 05 '12 at 07:37

Nikana Reklawyks

3,233
3
33
49

answered Feb 14 '12 at 14:12

MRM

435
2
10

Counter `$i` is unnecessary. `$arrDif[]=$value;` should do the trick ;) – Wh1T3h4Ck5 Feb 14 '12 at 14:19

score 0 · Answer 5 · answered Feb 14 '12 at 15:01

0

You can solve this with array_udiff()

function arr_comp($a, $b)
{
   if ($a['id'] == $b['id'])
       return 0;
   else if ($a['id'] > $b['id'])
       return 1;
   else
       return -1;
}

$result = array_udiff($arr2, $arr1, 'arr_comp');

or if you don't know in which array the differences may be you can try:

$res1 = array_udiff($arr1, $arr2, 'arr_comp');
$res2 = array_udiff($arr2, $arr1, 'arr_comp');
$result = array_merge($res1, $res2);

answered Feb 14 '12 at 15:01

h00ligan

1,471
9
17

You can simplify the arr_comp function to only test for '==' and even test other parameters as well. – h00ligan Feb 14 '12 at 15:03

Robbietjuh · Answer 6 · 2012-02-14T14:34:54.360

-1

Take a look at the PHP built-in function array_diff. That'll help you out :-) Just pass your two arrays, and store the array returned by array_diff(), which will contain the differences between the two arrays.

As you're using multi-dimensional arrays, look at this comment on the PHP website: http://www.php.net/manual/en/function.array-diff.php#98680.

edited Feb 14 '12 at 14:34

answered Feb 14 '12 at 14:02

Robbietjuh

848
1
8
22

Find the difference from two arrays in php

6 Answers6

Code:

Output:

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