Array of objects not altered after first file write - php

Question

I have an empty array in a remote file but intend to momentarily add and alter objects in it. However, after adding an initial first set of objects, the array does not accept any more values. My error log reports unexpected 'Object' (T_STRING), expecting ')' meaning it regards the keyword "Object" as a string imputed by me so I guess the problem originates from my array structure. Here is the code I used in adding the objects
include 'all_users.php';
$francis_udeh = new Admin("francis_udeh");
$all_users['francis_udeh'] = $francis_udeh;
$victor_nwafor = new Member("victor_nwafor");
$all_users['victor_nwafor'] = $victor_nwafor;
$print_arr = print_r($all_users, TRUE);
$updated_arr = "<?php \n \$all_users = $print_arr; \n?>";
file_put_contents('all_users.php', $updated_arr);
returns the following in the remote file
<?php
$all_users = Array
(
[francis_udeh] => Admin Object
(
[name] => francis udeh
[pagename] => francis.udeh
[can_comment] => 1
[can_view_announcements] => 1
[profile_pic] => /blog/accounts/assets/user.png
[can_delete_comment] => 1
)
[victor_nwafor] => Member Object
(
[name] => victor nwafor
[pagename] => victor.nwafor
[can_comment] => 1
[can_view_announcements] => 1
[profile_pic] => /blog/accounts/assets/user.png
)
);
?>
(which, by the way, is what I want). However, when I try
include 'all_users.php';
$raheem_sadiq = new Member("raheem_sadiq");
$all_users['raheem_sadiq'] = $raheem_sadiq;
$print_arr = print_r($all_users, TRUE);
$updated_arr = "<?php \n \$all_users = $print_arr; \n?>";
file_put_contents('all_users.php', $updated_arr);
it returns the error I posted earlier resulting in the array not changing. What am I doing wrong?

Answer 1

You include all_users.php at the beginning of code, but after first file_put_contents() it's a not correct php code in this file.

Answer 2

As #Indra already mentioned: the output given by print_r() is human readable, but not valid php code. If you don't have the possibilty to pass the data via a data storage (like mysql), it might be a workaround to put it to the file with serialize(). Alternatively, you could also use json (as your objects seem to be data access objects of some same kind) and then instantiate the objects remotely.
Hope this helps,
Greetings