[PHP] Doesn't generate attributes, getters, setters etc.for Model child classes

Description

It seems that Codegen doesn't process and generate attributes, setters and getters for child Model classes.
On the example below as you can see class User is a child class of Profile (extends class Profile) and contains extra attributes.

Parent class (Profile) seems to be processed and generated correctly, but child class (User) has not been processed correctly. Please look at the code examples below.

Swagger-codegen version

3.0.11

Swagger declaration file content or url

Here is a relevant API docs extraction from Swagger@OAS3

components:
  schemas:
    Profile:
      type: object
      properties:
        id:
          type: string
          format: uuid
          example: d290f1ee-6c54-4b01-90e6-d701748f0851
        firstName:
          type: string
          example: John
        lastName:
          type: string
          example: Smith
        email:
          type: string
          format: email
          example: john.smith@example.com
        phone:
          type: string
          format: phone
          nullable: true
          example: "+44 1260 1234567"
        avatar:
          type: string
          format: url
          nullable: true
          example: "https://example.com/john_smith.png"
    User:
      type: object
      allOf:
        - $ref: '#/components/schemas/Profile'
      properties:
        password:
          type: string
          example: SL3ZHkBnt8GmDWIxyD8O
        emailVerifiedAt:
          type: string
          format: date-time
          nullable: true
          example: "2019-06-23 11:47:23"
        rememberToken:
          type: string
          minLength: 64
          maxLength: 64
          nullable: true
          example: "0mdCVQ4ozf3nNRpoeCoZRtGULXNx6Bb6gOxit9NWU1e8FPcglV3jLmXpDHh5njHc"
        blocked:
          type: boolean
          default: false
          example: false
        tcAccepted:
          type: boolean
          default: true
          example: true
        role:
          type: string
          example: admin.account
        permissions:
          type: array
          items:
            type: string
            example: accounts.own.read
        createdAt:
          $ref: '#/components/schemas/DateTime'
        updatedAt:
          $ref: '#/components/schemas/DateTime'

Here is an extraction from PHP generated classes:

• Profile class:

<?php

/**
 * Swagger Codegen version: 3.0.11
 */
/**
 * NOTE: This class is auto generated by the swagger code generator program.
 * https://github.com/swagger-api/swagger-codegen
 * Do not edit the class manually.
 */

namespace MsAccounts\Client\Model;

use \ArrayAccess;
use \MsAccounts\Client\ObjectSerializer;

/**
 * Profile Class Doc Comment
 *
 * @category Class
 * @package  MsAccounts\Client
 * @author   Swagger Codegen team
 * @link     https://github.com/swagger-api/swagger-codegen
 */
class Profile implements ModelInterface, ArrayAccess
{
    const DISCRIMINATOR = null;

    /**
      * The original name of the model.
      *
      * @var string
      */
    protected static $swaggerModelName = 'Profile';

    /**
      * Array of property to type mappings. Used for (de)serialization
      *
      * @var string[]
      */
    protected static $swaggerTypes = [
        'id' => 'string',
'firstName' => 'string',
'lastName' => 'string',
'email' => 'string',
'phone' => 'string',
'avatar' => 'string'    ];

    /**
      * Array of property to format mappings. Used for (de)serialization
      *
      * @var string[]
      */
    protected static $swaggerFormats = [
        'id' => 'uuid',
'firstName' => null,
'lastName' => null,
'email' => 'email',
'phone' => 'phone',
'avatar' => 'url'    ];

    /**
     * Array of property to type mappings. Used for (de)serialization
     *
     * @return array
     */
    public static function swaggerTypes()
    {
        return self::$swaggerTypes;
    }

    /**
     * Array of property to format mappings. Used for (de)serialization
     *
     * @return array
     */
    public static function swaggerFormats()
    {
        return self::$swaggerFormats;
    }

    /**
     * Array of attributes where the key is the local name,
     * and the value is the original name
     *
     * @var string[]
     */
    protected static $attributeMap = [
        'id' => 'id',
'firstName' => 'firstName',
'lastName' => 'lastName',
'email' => 'email',
'phone' => 'phone',
'avatar' => 'avatar'    ];

    /**
     * Array of attributes to setter functions (for deserialization of responses)
     *
     * @var string[]
     */
    protected static $setters = [
        'id' => 'setId',
'firstName' => 'setFirstName',
'lastName' => 'setLastName',
'email' => 'setEmail',
'phone' => 'setPhone',
'avatar' => 'setAvatar'    ];

    /**
     * Array of attributes to getter functions (for serialization of requests)
     *
     * @var string[]
     */
    protected static $getters = [
        'id' => 'getId',
'firstName' => 'getFirstName',
'lastName' => 'getLastName',
'email' => 'getEmail',
'phone' => 'getPhone',
'avatar' => 'getAvatar'    ];

    /**
     * Array of attributes where the key is the local name,
     * and the value is the original name
     *
     * @return array
     */
    public static function attributeMap()
    {
        return self::$attributeMap;
    }

    /**
     * Array of attributes to setter functions (for deserialization of responses)
     *
     * @return array
     */
    public static function setters()
    {
        return self::$setters;
    }

    /**
     * Array of attributes to getter functions (for serialization of requests)
     *
     * @return array
     */
    public static function getters()
    {
        return self::$getters;
    }

    /**
     * The original name of the model.
     *
     * @return string
     */
    public function getModelName()
    {
        return self::$swaggerModelName;
    }

    

    /**
     * Associative array for storing property values
     *
     * @var mixed[]
     */
    protected $container = [];

    /**
     * Constructor
     *
     * @param mixed[] $data Associated array of property values
     *                      initializing the model
     */
    public function __construct(array $data = null)
    {
        $this->container['id'] = isset($data['id']) ? $data['id'] : null;
        $this->container['firstName'] = isset($data['firstName']) ? $data['firstName'] : null;
        $this->container['lastName'] = isset($data['lastName']) ? $data['lastName'] : null;
        $this->container['email'] = isset($data['email']) ? $data['email'] : null;
        $this->container['phone'] = isset($data['phone']) ? $data['phone'] : null;
        $this->container['avatar'] = isset($data['avatar']) ? $data['avatar'] : null;
    }

// Cutting code here as the essence is shown above

• User class:

<?php

/**
 * Generated by: https://github.com/swagger-api/swagger-codegen.git
 * Swagger Codegen version: 3.0.11
 */
/**
 * NOTE: This class is auto generated by the swagger code generator program.
 * https://github.com/swagger-api/swagger-codegen
 * Do not edit the class manually.
 */

namespace MsAccounts\Client\Model;
use \MsAccounts\Client\ObjectSerializer;

/**
 * User Class Doc Comment
 *
 * @category Class
 * @package  MsAccounts\Client
 * @author   Swagger Codegen team
 * @link     https://github.com/swagger-api/swagger-codegen
 */
class User extends Profile 
{
    const DISCRIMINATOR = null;

    /**
      * The original name of the model.
      *
      * @var string
      */
    protected static $swaggerModelName = 'User';

    /**
      * Array of property to type mappings. Used for (de)serialization
      *
      * @var string[]
      */
    protected static $swaggerTypes = [
            ];

    /**
      * Array of property to format mappings. Used for (de)serialization
      *
      * @var string[]
      */
    protected static $swaggerFormats = [
            ];

    /**
     * Array of property to type mappings. Used for (de)serialization
     *
     * @return array
     */
    public static function swaggerTypes()
    {
        return self::$swaggerTypes + parent::swaggerTypes();
    }

    /**
     * Array of property to format mappings. Used for (de)serialization
     *
     * @return array
     */
    public static function swaggerFormats()
    {
        return self::$swaggerFormats + parent::swaggerFormats();
    }

    /**
     * Array of attributes where the key is the local name,
     * and the value is the original name
     *
     * @var string[]
     */
    protected static $attributeMap = [
            ];

    /**
     * Array of attributes to setter functions (for deserialization of responses)
     *
     * @var string[]
     */
    protected static $setters = [
            ];

    /**
     * Array of attributes to getter functions (for serialization of requests)
     *
     * @var string[]
     */
    protected static $getters = [
            ];

    /**
     * Array of attributes where the key is the local name,
     * and the value is the original name
     *
     * @return array
     */
    public static function attributeMap()
    {
        return parent::attributeMap() + self::$attributeMap;
    }

    /**
     * Array of attributes to setter functions (for deserialization of responses)
     *
     * @return array
     */
    public static function setters()
    {
        return parent::setters() + self::$setters;
    }

    /**
     * Array of attributes to getter functions (for serialization of requests)
     *
     * @return array
     */
    public static function getters()
    {
        return parent::getters() + self::$getters;
    }

    /**
     * The original name of the model.
     *
     * @return string
     */
    public function getModelName()
    {
        return self::$swaggerModelName;
    }

    


    /**
     * Constructor
     *
     * @param mixed[] $data Associated array of property values
     *                      initializing the model
     */
    public function __construct(array $data = null)
    {
        parent::__construct($data);

    }

// Cutting code here as the essence is shown above

As you can see all User model related attributes, setters, geters etc. are missing.

Command line used for generation

Generated directly from SwaggerHub panel: EXPORT -> Client SDK -> php

Steps to reproduce

Simply, try to generate SDK library for any scenario which includes classes extending (referencing) parent class.

Related issues/PRs

Couldn't find any.

Suggest a fix/enhancement

Start by reproducing the SwaggerHub PHP SDK export with the supplied Profile/User OpenAPI schema and compare the generated classes. Trace how the PHP generator handles allOf inheritance, then verify that User includes its declared properties, attribute mappings, getters, setters, and constructor initialization.