Organize or group data from multidimensional array - php

Question

I have a multidimensional array that I'm having difficulty trying to group and sort for a particular need. Here is the array:
Array (
[0] => Array (
[0] => Joe Smith
[1] => Array (
[0] => 3
[1] => 9
)
)
[1] => Array (
[0] => John Doe
[1] => Array (
[0] => 6
[1] => 12
)
)
[2] => Array (
[0] => Jack Frost
[1] => Array (
[0] => 2
[1] => 4
)
)
)
What I want to do is sort the numbers from smallest to shortest (i.e. 2,3,4,6,9,12), but also keep the names associated with those numbers. For example:
2 (Jack Frost),
3 (Joe Smith),
4 (Jack Frost),
6 (John Doe),
9 (Joe Smith),
12 (John Doe)
Any ideas how to sort by number and keep the names together? Thanks
UPDATE 1
Here is the PHP code I've used to list the numbers in order:
$users = get_users();
$names = array();
$days = array();
foreach( $users as $user ) {
$names[] = $user->display_name;
$days[] = $user->member_day;
}
$result = array_map( null, $names, $days );
$mdays = array();
foreach( $days as $d ) {
foreach( $d as $d2) {
$mdays[] = $d2;
}
}
for( $i; $i<=31; $i++ ) {
if( in_array($i, $mdays) ) {
echo $i . '<br>';
}
}
In the above code, $result prints out the above Array. Also, the for loop sorts the "days".
The end goal is to have 31 blocks and fill in the block by number with the name.

Answer 1

You can do something like as
$result = [];
foreach ($arr as $key => $value) {
foreach ($value[1] as $v) {
$result[$v] = $value[0];
}
}
ksort($result);
print_r($result);
Output:
Array
(
[2] => Jack Frost
[3] => Joe Smith
[4] => Jack Frost
[6] => John Doe
[9] => Joe Smith
[12] => John Doe
)
Note: This'll work fine till none of the array array contains the same key

Answer 2

something like this should work, and at the end you can soert you array
$final_array=array();
foreach (array as $arr){
foreach($arr as $aaa){
$final_array[]=array($aaa,$arr[0])
}
}