How can i merge multiple associative arrays by a unique username - php

Question

I need to merge 3 associative arrays into a single associative array with unique usernames
My 3 arrays look like this: (var_export)
acceptedArray
array ( 'user1' => 1, 'user2' => 1, 'user3' => 1, )
pendingArray
array ( 'user1' => 1, 'user3' => 2, 'user15' => 3, )
deniedArray
array ( 'user1' => 1, 'user15' => 22, 'user20' => 5, )
every array is a array_count_values of a query fetch.
i need to have an output like this:
$return = [
['username' => user1, 'accepted' => 1, 'pending' => 3 , 'denied' => 1]
['username' => user2, 'accepted' => 1, 'pending' => 4]
];
i tried this (yes, completely off):
foreach ($acceptedUsers as $key => $value) {
$return[] = array('username' => $key, 'accepted' => $value);
}
foreach ($pendingUsers as $key => $value) {
$return[] = array('username' => $key, 'pending' => $value);
}
but that's creating duplicates and not appending.

Answer 1

Iterate individual arrays and use the usernames as keys for grouping.
Code: (Demo)
$acceptedUsers = ["user1" => 1, "user2" => 1, "user3" => 1];
$pendingUsers = ["user1" => 3, "user2" => 4, "user5" => 2];
$deniedUsers = ["user1" => 1, "user15" => 4, "user10" => 2];
foreach ($acceptedUsers as $user => $count) {
$result[$user]['accepted'] = $count;
}
foreach ($pendingUsers as $user => $count) {
$result[$user]['pending'] = $count;
}
foreach ($deniedUsers as $user => $count) {
$result[$user]['denied'] = $count;
}
var_export($result);
And if you need the username inside the subarrays, it's probably less convoluted to just loop the groups once more. https://3v4l.org/0rUv5
foreach ($acceptedUsers as $user => $count) {
$grouped[$user]['accepted'] = $count;
}
foreach ($pendingUsers as $user => $count) {
$grouped[$user]['pending'] = $count;
}
foreach ($deniedUsers as $user => $count) {
$grouped[$user]['denied'] = $count;
}
foreach ($grouped as $user => $row) {
$result[] = ['username' => $user] + $row;
}
var_export($result);
Otherwise, make isset() checks in loop 2 and 3. https://3v4l.org/3sstg
foreach ($acceptedUsers as $user => $count) {
$grouped[$user]['username'] = $user;
$grouped[$user]['accepted'] = $count;
}
foreach ($pendingUsers as $user => $count) {
if (!isset($grouped[$user])) {
$grouped[$user]['username'] = $user;
}
$grouped[$user]['pending'] = $count;
}
foreach ($deniedUsers as $user => $count) {
if (!isset($grouped[$user])) {
$grouped[$user]['username'] = $user;
}
$grouped[$user]['denied'] = $count;
}
var_export(array_values($grouped));
or brutal-force the usernames (unconditionally overwrite pre-existing username elements) https://3v4l.org/I1kBu
foreach ($acceptedUsers as $user => $count) {
$grouped[$user]['username'] = $user;
$grouped[$user]['accepted'] = $count;
}
foreach ($pendingUsers as $user => $count) {
$grouped[$user]['username'] = $user;
$grouped[$user]['pending'] = $count;
}
foreach ($deniedUsers as $user => $count) {
$grouped[$user]['username'] = $user;
$grouped[$user]['denied'] = $count;
}
var_export(array_values($grouped));

Answer 2

You can try this code for getting your result
$acceptedArray = array ( 'user1' => 1, 'user2' => 1, 'user3' => 1 );
$pendingArray = array ( 'user1' => 1, 'user3' => 2, 'user15' => 3 );
$deniedArray = array ( 'user1' => 1, 'user15' => 22, 'user20' => 5 );
// Get all distinct username from 3 arrays given
$u1 = array_unique(array_merge(array_keys($acceptedArray),array_keys($pendingArray),array_keys($deniedArray)));
$result = array(); // Initialize the result array
$index=0;
// Loop through each username and check if he has accept value, pending value and denied value
// If value exist, we assign value from array else set it as 0
foreach($u1 as $key => $val){
$tmp = array();
$tmp['username'] = $val;
if(isset($pendingArray[$val]))
$tmp['pending'] = $pendingArray[$val];
else
$tmp['pending'] = 0;
if(isset($acceptedArray[$val]))
$tmp['accepted'] = $acceptedArray[$val];
else
$tmp['accepted'] = 0;
if(isset($deniedArray[$val]))
$tmp['denied'] = $deniedArray[$val];
else
$tmp['denied'] = 0;
$result[$index] = $tmp;
$index++;
}
Demo link is https://3v4l.org/ZnFuX