store nested object chain in a variable - php

Question

so lets say i have a object like this
{
"status": "AlreadyVerified"
}
and i want to store propert key in variable so i can access property using that variable like
$key = 'status';
echo $object->$key
but what if i have a nested object like
{
"extra_info": {#305 ▼
+"status": "AlreadyVerified"
}
}
this wouldn't work
$key = 'extra_info->status';
echo $object->$key
how can i store nested object chain in a variable so i can access its property using that variable ?
preferably some way that works for both nested and flat objects (i guess that's what the're called !)

Answer 1

It can be possible by write helper function like this:
function deepFind($o, $key) {
$key = explode('->', $key);
$value = $o;
foreach ($key as $i=>$k) {
if (is_object($value) && isset($value->{$k})) {
$value = $value->{$k};
} elseif (is_array($value) && isset($value[$k])) {
$value = $value[$k];
} elseif ($i == count($key) - 1) {
$value = null;
}
}
return $value;
}
Usage:
$o = (object)[
"extra_info" => (object)[
"status" => "AlreadyVerified"
]
];
echo deepFind($o, 'extra_info->status');
Online demo

Answer 2

This is one way to do it, albeit potentially insecure depending on where $key comes from:
<?php
$object = new stdClass();
$object->extra_info = new stdClass();
$object->extra_info->status = 'AlreadyVerified';
$key = 'extra_info->status';
eval( 'echo $object->'.$key.';' );
Output:
AlreadyVerified
Additionally, if you wanted to parse $key then you could use a recursive function to access the nested value.