How to convert array to object - php

Question

First, I have tried to find solution within the source here but couldn't find what I am looking so posting as a new question. Thanks for your help
I want to convert Array to Object. Here is what I am getting output
Array
(
[0] => stdClass Object
(
[id] => 1
[username] => robustsolver
[first_name] => John
[last_name] => Smith
)
[1] => stdClass Object
(
[id] => 2
[username] => pickypacker
[first_name] => Peter
[last_name] => Packer
)
)
So if I want any column for all users than I have to write code $users[0]->first_name; which gives me only one item. But what I am looking is to use $users->first_name and this should return an array of all user's column (here is first_name)
Hope I have explain in better way. :S

Answer 1

You can try this where $arr is your array:
function filter_callback($element) {
return $element->first_name;
}
$result= array_map('filter_callback', $arr);
From a quick test, this seems to work. It keeps objects of the array without your wanted property but its value is set to NULL. Not sure if that's what you want but you can edit the filter_callback to remove such elements.

Answer 2

Maybe something like this will work (not tested):
$arr = array(...); // array of objects (in)
$obj = new Object; // object of arrays (out)
foreach($arr as $a) {
foreach(get_object_vars($a) as $k=>$v) {
if(!property_exists($obj, $k)) {
$obj->{$k} = array();
}
$obj->{$k}[] = $v;
}
}

Answer 3

consider defining a new class:
class User_objects
{
public $first_name;
public $username;
public $last_name;
public function __construct()
{
$this->first_name = array();
$this->username = array();
$this->last_name = array();
}
}
then:
consider $array_of_objects to be your array of objects (input).
$users = new User_objects();
foreach ($array_of_objects as $object)
{
$users->first_name[] = $object->first_name; // append to array
$users->last_name[] = $object->last_name;
$users->username[] = $object->username;
}
then you can get your array from $users->first_name

Answer 4

You can write a simple helper function that will aid in the columns you wish to select:
function prop_selector($prop)
{
return function($item) use ($prop) {
return $item->{$prop};
};
}
$first_names = array_map(prop_selector('first_name'), $users);
$last_names = array_map(prop_selector('last_name'), $users);