Create an array based on multiple arrays by key - php

Question

Please help me to combine four arrays in one.
I have to compare main array keys and if the key of the secondaries arrays coincides, add them to the new array.
I tried to combine different php functions, but without the expected result and nothing relevant.
This is the main array.
[0] => Array
(
[1] => "Category1"
[2] => "Category2"
[3] => "Category3"
[4] => "Category4"
)
These are the secondaries arrays
[1] => Array
(
[1] "user_test_[1]" key 1 map to --> [1] Category1
[2] "user_test_[2]" key 2 map to --> [2] Category2
[3] "user_test_[3]" key 3 map to --> [3] Category3
[4] "user_test_[4]" key 4 map to --> [4] Category4
)
[2] => Array
(
2: "user_prod_[2]" key 2 map to --> [2] Category2
4: "user_prod_[4]" key 4 map to --> [4] Category4
)
[3] => Array
(
[3] "user_uat_[3]" key 3 map to --> [3] Category3
[4] "user_uat_[4]" key 4 map to --> [4] Category4
)
New array results in php format:
$array_result = array(
'Category1'=>array(
'user_test_[1]'
),
'Category2'=>array(
'user_test_[2]',
'user_prod_[2]'
),
'Category3'=>array(
'user_test_[3]',
'user_uat_[3]'
),
'Category4'=>array(
'user_test_[4]',
'user_prod_[4]',
'user_uat_[4]'
)
);
Main array in in php format:
$array_cat = array(1=>"Category1", 2=>"Category2", 3=>"Category3", 4=>"Category4");
These are the secondaries arrays in php fromat:
$array_usrtest = array(1=>"user_test_[1]", 2=>"user_test_[2]", 3=>"user_test_[3]", 4=>"user_test_[4]");
$array_usruat = array(3=>"user_uat_[3]", 4=>"user_uat_[4]");
$array_usrprod = array(2=>"user_prod_[2]", 4=>"user_prod_[4]");
Expected results
array{
["Category1"]=>array(1)
{
[0]=>"user_test_[1]"
}
["Category2"]=>array(2)
{
[0]=>"user_test_[2]"
[1]=>"user_prod_[2]"
}
["Category3"]=>array(3)
{
[0]=>"user_test_[3]"
[2]=>"user_uat_[3]"
}
["Category4"]=>array(3)
{
[0]=>"user_test_[4]"
[1]=>"user_prod_[4]"
[2]=>"user_uat_[4]"
}
}

Answer 1

Here is simple solution, which it's not very good, because it is solution for your specific values, but it is good start point and if you want, you can improve it:
<?php
$array_cat = array(1=>"Category1", 2=>"Category2", 3=>"Category3", 4=>"Category4");
$array_usrtest = array(1=>"user_test_[1]", 2=>"user_test_[2]", 3=>"user_test_[3]", 4=>"user_test_[4]");
$array_usruat = array(3=>"user_uat_[3]", 4=>"user_uat_[4]");
$array_usrprod = array(2=>"user_prod_[2]", 4=>"user_prod_[4]");
$result = [];
foreach ($array_cat as $k => $v) {
$result[$v] = []; // fill result array with categories
}
$values = array_merge($array_usrtest, $array_usruat, $array_usrprod); // merge arrays into one (all items)
foreach ($values as $k => $value) { // iterate over all values
preg_match('!\d+!', $value, $match); // get index in [index]
$result['Category' . $match[0]][] = $value; // append values to category
}
echo '<pre>';
var_dump($result);
Result:
array(4) {
["Category1"]=>
array(1) {
[0]=>
string(13) "user_test_[1]"
}
["Category2"]=>
array(2) {
[0]=>
string(13) "user_test_[2]"
[1]=>
string(13) "user_prod_[2]"
}
["Category3"]=>
array(2) {
[0]=>
string(13) "user_test_[3]"
[1]=>
string(12) "user_uat_[3]"
}
["Category4"]=>
array(3) {
[0]=>
string(13) "user_test_[4]"
[1]=>
string(12) "user_uat_[4]"
[2]=>
string(13) "user_prod_[4]"
}
}

Answer 2

I would say merge all array and then build the category array
$arrs = array_merge($array_usrtest, $array_usruat, $array_usrprod);
$categories = array_fill_keys($array_cat, []);
array_walk($arrs, function($item) use (& $categories){
preg_match('#(.*)\[(\d)\]#', $item, $matches);
$key = $matches[2];
$categories['Category' . $key][] = $item;
});
print_r($categories);

Answer 3

Based on yours answers:
<?php
$array_cat = array(1=>"Category1", 2=>"Category2", 3=>"Category3", 4=>"Category4");
$array_usrtest = array(1=>"user_test_[1]", 2=>"user_test_[2]", 3=>"user_test_[3]", 4=>"user_test_[4]");
$array_usruat = array(3=>"user_uat_[3]", 4=>"user_uat_[4]");
$array_usrprod = array(2=>"user_prod_[2]", 4=>"user_prod_[4]");
$values = array_merge($array_usrtest, $array_usruat, $array_usrprod);
$result = [];
foreach ($array_cat as $key => $cat) {
foreach ($values as $k => $value) { // iterate over all values
preg_match('!\d+!', $value, $match); // get index in [index]
if ($key == $match[0]) {
$result[$cat][] = $value; //append values to category
}
}
}
echo '<pre>';
var_dump($result);
?>
Result:
array(4) {
["Category1"]=>
array(1) {
[0]=>
string(13) "user_test_[1]"
}
["Category2"]=>
array(2) {
[0]=>
string(13) "user_test_[2]"
[1]=>
string(13) "user_prod_[2]"
}
["Category3"]=>
array(2) {
[0]=>
string(13) "user_test_[3]"
[1]=>
string(12) "user_uat_[3]"
}
["Category4"]=>
array(3) {
[0]=>
string(13) "user_test_[4]"
[1]=>
string(12) "user_uat_[4]"
[2]=>
string(13) "user_prod_[4]"
}
}