How to merge Arrays having same keys only and neglect different keys? - php

Question

I am new in PHP and love to learn it.
I want to merge two or more arrays having same keys only. And neglect the arrays whose keys are not in both the Arrays. Like
Here is the First Array :
Array
(
[1] => Array
(
[111] => 36265
)
[2] => Array
(
[222] => 36265
)
[3] => Array
(
[333] => 36265
)
)
and Second Array as :
Array
(
[1] => Array
(
[444] => 36265
)
[2] => Array
(
[555] => 36265
)
[4] => Array
(
[666] => 36265
)
)
And i want my result to be as :
Array
(
[1] => Array
(
[111] => 36265
[444] => 36265
)
[2] => Array
(
[222] => 36265
[555] => 36265
)
)
Neglecting the rest Array with key [3] & [4]....
So Please anyone tell me how to get this. I try out "array_merge_recursive()" but this one displays all keys.
Thanks in advance.

Answer 1

You'd have to loop over one of the arrays, check for the existence of the current key in the other array, if it exists, merge them, eg:
$output = array();
foreach ($array1 as $key => $value) {
if (array_key_exists($key, $array2)) {
$output[$key] = $value + $array2[$key];
}
}
Here's a demo

Answer 2

You're probably looking for array_intersect_key.

Answer 3

You could also use a foreacah loop and create a new one. While in this loop you can use one of the arrays keys to match them both. Consider this example:
$array1 = array( 1 => array(111 => 36265), 2 => array(222 => 36265), 3 => array(333 => 36265), ); $array2 = array( 1 => array(444 => 36265), 2 => array(555 => 36265), 4 => array(666 => 36265), );
$new_array = array();
foreach($array1 as $key => $value) {
if(isset($array2[$key])) {
$new_array[$key][key($array1[$key])] = reset($array1[$key]);
$new_array[$key][key($array2[$key])] = reset($array2[$key]);
}
}
echo '<pre>';
print_r($new_array);
echo '</pre>';
Should yield something like this:
Array
(
[1] => Array
(
[111] => 36265
[444] => 36265
)
[2] => Array
(
[222] => 36265
[555] => 36265
)
)