Merge two dimensional array in PHP - php

Question

for a long time can't resolve smth looking like as very simple matter... I want merge a two dimensional arrays.
The example:
$arr1 = {
[532] =
{
[0] = "11"
[1] = "12"
}
[273] =
{
[0] = "99"
}
}
$arr2 = {
[532] =
{
[0] = "11"
[1] = "13"
}
}
And the result of merging should be, a map on common keys, exactly like that array:
$result = {
[532] =
{
[0] =
{
[0] = "11"
[1] = "12"
}
[1] =
{
[0] = "11"
[1] = "13"
}
}
[273]
[0] =
{
[0] = "99"
}
[1] =
{
}
}
I try sometihng like that:
$result = $arr1;
foreach ($arr2 as $key => $value) {
$result[$key] = isset($result[$key]) ? array_merge([$result[$key]], [$value]) : [$value];
}
But it doesnt work if $arr2 is empty :(

Answer 1

For the second array checking, you need to use isset() either array set or not:
Example:
<?php
$arr1 = array('532'=>array('11','12'),'273'=>array('99'));
$arr2 = array('532'=>array('11','13'));
$newArr = array();
foreach ($arr1 as $key => $value) {
if(isset($arr2[$key])){
$newArr[$key][] = $value;
$newArr[$key][] = $arr2[$key];
}
else{
$newArr[$key] = $value;
}
}
echo "<pre>";
print_r($newArr);
?>
Result:
Array
(
[532] => Array
(
[0] => Array
(
[0] => 11
[1] => 12
)
[1] => Array
(
[0] => 11
[1] => 13
)
)
[273] => Array
(
[0] => 99
)
)
Further more, if you want to merge both same index than you can use array_merge() some thing like that:
<?php
$arr1 = array('532'=>array('11','12'),'273'=>array('99'));
$arr2 = array('532'=>array('11','13'));
$newArr = array();
foreach ($arr1 as $key => $value) {
if(isset($arr2[$key])){
$newArr[$key][] = array_merge($value,$arr2[$key]);
}
else{
$newArr[$key] = $value;
}
}
echo "<pre>";
print_r($newArr);
?>
Result:
Array
(
[532] => Array
(
[0] => Array
(
[0] => 11
[1] => 12
[2] => 11
[3] => 13
)
)
[273] => Array
(
[0] => 99
)
)
Note that, ist script, will give you result as you need with unique index.
Second script will give you all values in one single array.

Answer 2

Probably something like this
$arr1 = {
[532] =
{
[0] = "11"
[1] = "12"
}
[273] =
{
[0] = "99"
}
}
$arr2 = {
[532] =
{
[0] = "11"
[1] = "13"
}
}
$newarray = array();
foreach ($arr1 as $key => $value) {
$cu = $arr1[$key];
$newarray[$key][] = $cu;
if(!isset($arr2[$key])) {
$newarray[$key][] = array();
}
else {
$newarray[$key][] = $arr2[$key];
}
}
foreach ($arr2 as $key => $value) {
if(!isset($newarray[$key])) {
$newarray[$key][] = $arr2[$key];
}
}