multidimensional array - adding a key and value where a key and value is matched

Question

I'm trying to add a key and value (associative) from an array to another array, where one specific key and value match. Here are the two arrays:

$array1 = array(
            1 => array(
                'walgreens' => 'location',
                'apples' => 'product1',
                'oranges' => 'product2'
            ),
            2 => array(
                'walmart' => 'location',
                'apples' => 'product1',
                'oranges' => 'product2',
                'milk' => 'product3'
            )
       );
$array2 = array(
            1 => array(
                'walgreens' => 'location',
                'apples' => 'product1',
                'oranges' => 'product2',
                'bananas' => 'product3',
            )
      );

Here is the attempt I made at modifying $array1 to have key 'bananas' and value 'product3':

$dataCJ = getCJItem($isbn);
         foreach ($array1 as $subKey => $subArray) {
            foreach($subArray as $dkey => $dval){
                foreach($array2 as $cjk => $cjv){
                    foreach($cjv as $cjkey => $cjval){
                         if($dval['walgreens'] == $cjval['walgreens']){
                              $dval['bananas'] = $cjval['bananas'];
                         }
                    }
                }
            }
         }

This doesn't work. How can I fix this?

What output do you want for your input example?

kirilloid
– kirilloid

2012-08-03 20:41:25 +00:00
Commented Aug 3, 2012 at 20:41 — kirilloid
– kirilloid, Commented Aug 3, 2012 at 20:41
Hard to workout without output format required..

raidenace
– raidenace

2012-08-03 20:58:51 +00:00
Commented Aug 3, 2012 at 20:58 — raidenace
– raidenace, Commented Aug 3, 2012 at 20:58

Explosion Pills · Accepted Answer · 2012-08-03 20:50:17Z

3

Change => $dval to => &$dval. Currently you are creating and writing to a new variable and the update will not work in-place.

answered Aug 3, 2012 at 20:50

Explosion Pills

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Comments

Hugo Dozois · Accepted Answer · 2013-03-27 01:04:38Z

2

I would look at array_merge() function!

Here is a start with the PHP doc.

For your specific case, you could do the following :

foreach($array1 as $key1 => $values1){
    foreach($array2 as $key2 => $values2){
        if($values1[0] == $values2[0]){
            $array1[$key1] = array_merge($values1, $values2);
        }
    }
}

Note to simplify the problem you should inverse the first key=> value pair of the array.

Having an array this way would be a lot simper :

array(
    'location' => "The location (eg:walgreens)",
    //...
);

This way you could change the comparison to the following instead :

$values1['location'] == $values2['location']

Which would be safer in the case the array is not built with the location as the first pair.

edited Mar 27, 2013 at 1:04

answered Aug 3, 2012 at 20:57

Hugo Dozois

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