PHP/MySQL: Recreate multidimensional array from existing array - php

Question

I've got an multi-array (currently with objects) that I want to reorder based on a specific key/value.
Array
(
[0] => stdClass Object
(
[task_id] => 1
[task_title] => Title
[users_username] => John
)
[1] => stdClass Object
(
[task_id] => 2
[task_title] => Title
[users_username] => John
)
[2] => stdClass Object
(
[task_id] => 3
[task_title] => Title
[users_username] => Mike
)
)
I'd like to reorder it to get multi-arrays by user_name, so I can cycle through the task by username.
Array
(
[John] => Array
(
[0] => Array
(
[task_id] => 1
[title] => Title
)
[1] => Array
(
[task_id] => 2
[title] => Title
)
)
[Mike] => Array
(
[0] => Array
(
[task_id] => 3
[title] => Title
)
)
)
Is it possible to recreate my array to an array like that above?

Answer 1

Updated version of the code
<?php
$it0 = (object) array('task_id' => 1,'task_title' => 'Title','users_username' => 'John');
$it1 = (object) array('task_id' => 2,'task_title' => 'Title','users_username' => 'John');
$it2 = (object) array('task_id' => 3,'task_title' => 'Title','users_username' => 'Mike');
$array = array($it0,$it1,$it2);
$return = array();
foreach($array as $id => $value){
$return[$value->users_username][] = array('task_id' => $value->task_id,'title' => $value->task_title);
}
var_dump($return);

Answer 2

Yes, it is possible.
You'll have to loop through your current array and create a new array to do it.
example:
$new_array = array();
foreach ($array as $row)
{
$new_row = array(
'task_id' => $row->task_id,
'title' => $row->task_title,
);
$name = $row->users_username;
if (isset($new_array[$name]))
{
$new_array[$name][] = $new_row;
}
else
{
$new_array[$name] = array($new_row);
}
}
Now $new_array contains the new array exactly like the one you're asking for.
Then you can sort it with
ksort($new_array);

Answer 3

There may be another way to do this, with some built-in function, but sometimes I'd rather just do it myself, and know how it is working, without having to look up the documentation.
The approach:
Iterate through all of the first array, looking at [users_username] and putting them into a new array.
Code:
$dst_array = array();
foreach ($src_array as $val)
{
$user = $val->users_username;
// TODO: This check may be unnecessary. Have to test to find out.
// If this username doesn't already have an array in the destination...
if (!array_key_exists($user, $dst_array))
$dst_array[$user] = array(); // Create a new array for that username
// Now add a new task_id and title entry in that username's array
$dst_array[$user][] = array(
'task_id' => $val->task_id
'title' => $val->title
);
}

Answer 4

Just something like this (maybe not 100% PHP code):
foreach ( $obj : $oldArray ) {
$newTask['task_id'] = $obj->task_id;
$newTask['title'] = $obj->title;
$newArray[$oldName][] = $newTask;
}
If you want to order it; you can just call a order function afterwards.