turn 2 array into one array

Question

In PHP there is two array:

$x = array( "a" => "0123", "b" => "1234", "c" => "0123");
$y = array( "a" => "3210", "b" => "1234", "d" => "0123");

i wish to get the result in one array like this:

// right
Array
(
[a] => 0123
[b] => 1234
[c] => 0123
[a] => 3210
[d] => 0123
)

I tried with array_merge($x, $y):

// wrong    
Array
(
[a] => 3210
[b] => 1234
[c] => 0123
)

It happen cause there is old database and new database, i am getting both value from both database. If value from both database ist exactly equal, then it needed only on value like this:

[b] => 1234

Please is there some solution in PHP-Code?

You can't have 2 indexes with the same name (`a` in this case) as stated => `[a] => 0123 [b] => 1234 [c] => 0123 [a] => 3210 [d] => 0123` And array_merge gives this result (with the `d` ) => `["a"]=> string(4) "3210" ["b"]=> string(4) "1234" ["c"]=> string(4) "0123" ["d"]=> string(4) "0123"` — ka_lin, May 23 '18 at 10:50
Possible duplicate of [Merging arrays with the same keys](https://stackoverflow.com/questions/5881443/merging-arrays-with-the-same-keys) — R B, May 23 '18 at 10:56
This won't happen, key name in an array is unique, it impossible you have two key named 'a' in an array. — Kevin Yan, May 23 '18 at 10:57
if the key 'a' repeat two time with different values, then consider 'a'=>value1, value2], this way you can have both different values — Gautam Rai, May 23 '18 at 10:59

score 2 · Answer 1 · answered May 23 '18 at 10:57

Becuase of you cant get same keys use array_merge_recursive. It will make muldimensional arrays for same keys.

$ar1 = array("color" => array("favorite" => "red"), 5);

$ar2 = array(10, "color" => array("favorite" => "green", "blue"));

$result = array_merge_recursive($ar1, $ar2);
[color] => Array
    (
        [favorite] => Array
            (
                [0] => red
                [1] => green
            )

        [0] => blue
    )

[0] => 5
[1] => 10

You could use the OP's actual data, might be more expresive – ka_lin May 23 '18 at 11:03 — ka_lin, May 23 '18 at 11:03

score 0 · Answer 2 · answered May 23 '18 at 10:52

Arrays cannot have duplicate keys, if keeping the keys isn't important to you then the following would work fine:

This code is pulled straight from the PHP array_merge documentation.

<?php
$array1 = array("color" => "red", 2, 4);
$array2 = array("a", "b", "color" => "green", "shape" => "trapezoid", 4);
$result = array_merge($array1, $array2);
print_r($result);
?>

Outputs:

Array
(
    [color] => green
    [0] => 2
    [1] => 4
    [2] => a
    [3] => b
    [shape] => trapezoid
    [4] => 4
)

Also see: array merge with duplicates php

turn 2 array into one array

2 Answers2