How to merge two nested associative array with same indexes?

Question

I have two arrays with same indexes, and unfortunately array_merge_recursive doesn't work for me.

First array is like this:

$firstarray = array(
    0 => array('id' => 1, 'name' => 'John Smith'),
    1 => array('id' => 2, 'name' => 'Jane Doe')         
);

Where second array is:

$secondarray = array(
    0 => array('email' => 'john@smith.com'),
    1 => array('email' => 'jane@doe.com')
);

Desired output would be like this,

Array
(
    [0] => Array
        (
            [id] => 1
            [name] => John Smith
            [email] => john@smith.com
        )

    [1] => Array
        (
            [id] => 2
            [name] => Jane Doe
            [email] => jane@doe.com
        )

)

But I am getting second array items appended to original array like this:

Array
(
    [0] => Array
        (
            [id] => 1
            [name] => John Smith
        )

    [1] => Array
        (
            [id] => 2
            [name] => Jane Doe
        )

    [2] => Array
        (
            [email] => john@smith.com
        )

    [3] => Array
        (
            [email] => jane@doe.com
        )

)

Refer to manual: `If, however, the arrays have the same numeric key, the later value will not overwrite the original value, but will be appended.` — u_mulder, Jun 15 '16 at 08:33

score 3 · Accepted Answer · answered Jun 15 '16 at 08:57

for($i = 0; $i<count($firstarray); $i++){
   $output[] = array_merge($firstarray[$i],$secondarray[$i]);
}

You can the above mentioned code or you can use array_map() & array_merge(). Like:

$output = array_map('array_merge', $firstarray, $secondarray);

score 1 · Answer 2 · answered Jun 15 '16 at 08:50

You guys sure go the complicated way :)

$mergedarray = array_map('array_merge', $firstarray, $secondarray);

Basically "merge the arrays of each index".

array_merge_recursive doesn't work because number index are not considered as associative key. So it just push the value instead of merging them.

Ravi Hirani · Answer 3 · 2016-06-15T08:46:50.883

0

Try below code:-

$firstarray = array(
    0 => array('id' => 1, 'name' => 'John Smith'),
    1 => array('id' => 2, 'name' => 'Jane Doe')         
);

$secondarray = array(
    0 => array('email' => 'john@smith.com'),
    1 => array('email' => 'jane@doe.com')
);

Use simple foreach loop

$res = [];
foreach($firstarray as $k=>$record){
  $record['email'] = $secondarray[$k]['email'];
  $res[] = $record;
}
echo '<pre>'; print_r($res);

OR use array_map() function

$res = array_map(function($a,$b){
  return ['id'=>$a['id'],'name'=>$a['name'],'email'=>$b['email']];
},$firstarray,$secondarray);
echo '<pre>'; print_r($res);

edited Jun 15 '16 at 08:46

answered Jun 15 '16 at 08:41

Ravi Hirani

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No need for a handmade callable, `array_merge()` already exist. – Kulvar Jun 15 '16 at 08:51
Yes. Agree with you but answer is correct and working then why down vote? You can definitely raise your point in your answer. – Ravi Hirani Jun 15 '16 at 08:56
downvoted because it's unnecessarily complicated ^_^ I'll change the downvote to an upvote if you edit of course. – Kulvar Jun 15 '16 at 08:57
You have already given answer bro. So no need for edit my answer. – Ravi Hirani Jun 15 '16 at 09:02

score 0 · Answer 4 · answered Jun 15 '16 at 08:44

Try this:

    $firstarray = array(
    0 => array('id' => 1, 'name' => 'John Smith'),
    1 => array('id' => 2, 'name' => 'Jane Doe')
 );

  $secondarray = array(
    0 => array('email' => 'john@smith.com'),
    1 => array('email' => 'jane@doe.com')
  );

 foreach($firstarray as $key1 => $value1)
 {
   foreach($secondarray as $key2 => $value2)
   {
        if($key1 == $key2)
        {
            $firstarray[$key1]["email"] = $value2["email"];
        }
    }
 }
 print_r($firstarray);

How to merge two nested associative array with same indexes?

4 Answers4