issue while merging two arrays using array_merge function

Question

I have two associative array.

$Array1 = array(
 'abc'=> 'abc',
 'def'=> 'def'
);

$Array2 = array(
 '123'=> '123',
 '456'=> '456'
);

I am merging them using array_merge.

$Array3 = array_merge($Array1, $Array2);

Now value of $Array3 is like this.

Array
(
    [abc] => abc
    [def] => def
    [0] => 123
    [1] => 456
)

It looks really odd until I read php manual which says Values in the input array with numeric keys will be renumbered with incrementing keys starting from zero in the result array. array_merge manual

My questing How can I merge both array without loosing their associative keys. Both array can have common KEYS and I don't want to loose my information also. :(

xdazz · Accepted Answer · 2014-04-04 09:54:40Z

1

By +:

$Array1 = array(
 'abc'=> 'abc',
 'def'=> 'def'
);

$Array2 = array(
 '123'=> '123',
 '456'=> '456'
);
var_dump($Array1 + $Array2);

This will preserve the index, but note this will not overwrite the value of the first array if same key exists in first array.

And if you want the overwrite working, then there is array_replace function for this:

var_dump(array_replace($Array1, $Array2));

edited Apr 4, 2014 at 9:54

answered Apr 4, 2014 at 9:48

xdazz

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4 Comments

Ritesh Chandora Over a year ago

Both array can have common KEYS and I don't want to loose my information also. :(. I updated the question.

xdazz Over a year ago

@RiteshChandora So what's the result you expected for that, 'common_key' => array('value1', 'value2') ?

Ritesh Chandora Over a year ago

both array are multidimensional. your code don't work for me.

Ritesh Chandora Over a year ago

array_replace_recursive() works well. thanks for help

Razor Jack · Accepted Answer · 2014-04-04 09:55:40Z

1

Try this code :) it will work

    function my_merge($array1,$array2)
    {
       foreach($array2 as $key => $value)
       {
         $array1[$key] = $value;
       }
       return $array1;
    }

    $Array1 = array(
          'abc'=> 'abc',
          'def'=> 'def'
    );

     $Array2 = array(
           '123'=> '123',
           '456'=> '456'
     );

     $Array3 = my_merge($Array1, $Array2);

answered Apr 4, 2014 at 9:55

Razor Jack

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Comments

Alma Do · Accepted Answer · 2014-04-04 10:03:42Z

1

For associative arrays, use

$result = $Array1 + $Array2;

-but note, that for numeric keys this will also re-index:

$Array1 = array(
 'abc',
 'def'=> 'def'
);

$Array2 = array(
 '123',
 '456'
);
var_dump($Array1 + $Array2);
//array(3) { [0]=> string(3) "abc" ["def"]=> string(3) "def" [1]=> string(3) "456" }

If you have same keys in your arrays, you can use:

$result = array_reduce(array_keys($Array1), function($c, $x) use ($Array1)
{
    $c[$x] = isset($c[$x])
       ?array_merge((array)$c[$x], [$Array1[$x]])
       :$Array1[$x];
    return $c;
}, $Array2);

edited Apr 4, 2014 at 10:03

answered Apr 4, 2014 at 9:49

Alma Do

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2 Comments

Ritesh Chandora Over a year ago

Both array can have common KEYS and I don't want to loose my information also. :(. I updated the question.

Alma Do Over a year ago

Hm, I've updated (so in that case you'll have array of values for such keys)

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