Passing array of Objects in php 7.3 - php

Question

Hi there still new to PHP and struggling with something really basic and it's frustrating me cause I can't see the error. I have read the PHP manual on passing array of objects.
class Customer{
public $companyId;
public $customerId;
public $name;
public function __construct($companyId,$customerId,$name)
{
$this->companyId = $companyId;
$this->customerId = $customerId;
$this->name = $name;
}
}
class CustomersDB
{
...
/**
* #return Customer[]
*/
public function getCustomers($search_str): array {
$resultObj = array();
$result = NULL;
try {
if (! $this->db) {
die('Database handle not defined') ;
}
if ($search_str && ! empty($search_str)) {
$result = $this->ListCustomers(Utils::COMPANY_ID, $search_str, $this->db);
while ($row = $result->fetch(PDO::FETCH_ASSOC)) {
$_tmp = new Customer($row['CompanyID'],
$row['CustomerID'],
$row['CustomerName']);
// $resultObj.push($_tmp);
$resultObj[] = $_tmp;
}
}
} catch (Exception $e) {
// echo Utils::logMsgtoWeb($e->getTraceAsString());
} finally {
$result = NULL;
}
return $resultObj;
}
}
use Respect\Rest\Routable;
class Customers implements Routable {
/**
*
* Can pass in a partial string to search for a customer
* or pass in an ID for a specific match.
*/
public function get($searchStr){
// header('Content-type: application/json');
$result = $this->custdb.getCustomers($searchStr); // ERRORS HERE
if ($result && ! empty($result)) {
return json_encode( $result);
} else {
return NULL;
}
}
}
I get this error: PHP Recoverable fatal error: Object of class Scheduler\db\CustomersDB could not be converted to string in Customers.php.
Any help would be appreciated.