How to merge two nested associative array with same indexes? [duplicate] - php

Question

This question already has answers here:
Merge row data from multiple arrays
(6 answers)
Closed 4 months ago.
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
)
)

Answer 1

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);

Answer 2

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.

Answer 3

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);

Answer 4

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);