[PHP] Empty Response for api call that has a response

Description

There is an empty response when calling searchCustomers. I traced the code and the response in json is correct but appears to have an issue deserializing and not having data back as objects/arrays

Swagger-codegen version

3

Swagger declaration file content or url

https://demo.phppointofsale.com/application/controllers/api/

Command line used for generation

php codegen

java -jar modules/swagger-codegen-cli/target/swagger-codegen-cli.jar generate -i https://demo.phppointofsale.com/application/controllers/api/ -l php -o /Users/cmuench/Desktop/api

Steps to reproduce

$apiInstance = new Swagger\Client\Api\CustomersApi(
    // If you want use custom http client, pass your client which implements `GuzzleHttp\ClientInterface`.
    // This is optional, `GuzzleHttp\Client` will be used as default.
    new GuzzleHttp\Client(),
    $config
);
$search = "Chris"; // string | Search customers
$search_field = "first_name"; // string | Search specific field
$offset = 0; // int | Offset to list customers
$limit = 20; // int | Number of customers to get

try {

   //always empty
    $result = $apiInstance->searchCustomers($search, $search_field, $offset, $limit);
    print_r($result);
} catch (Exception $e) {
    echo 'Exception when calling CustomersApi->searchCustomers: ', $e->getMessage(), PHP_EOL;
}

Related issues/PRs

Suggest a fix/enhancement

Start by reproducing the generated PHP client command against the linked API declaration and call CustomersApi::searchCustomers with the supplied parameters. Inspect the response deserialization path and compare it with the reported correct JSON response. Done means searchCustomers returns populated objects or arrays instead of an empty result.