[PHP] Bug missing commas in key-value arrays of generated models and parameter of function calls

Description

The code generated contains arrays like $swaggerTypes as members of Model types but the arrays do not
seem to contain any commas to seperate different key value pairs

Swagger-codegen version

3.0.0-rc1

Swagger declaration file content or url

This is the schema for the User object in the first snippet

"User": {
  "type": "object",
  "description": "User",
  "required": [
    "firstName",
    "email",
    "userGroupId"
  ],
  "properties": {
    "email": {
      "type": "string",
      "description": "Email"
    },
    "firstName": {
      "type": "string",
      "description": "First name"
    },
    "lastName": {
      "type": "string",
      "description": "Last name",
      "nullable": true
    },
    "userGroupId": {
      "type": "string",
      "format": "uuid",
      "description": "User group id"
    }
  }
}

Command line used for generation

java --add-opens=java.base/java.util=ALL-UNNAMED -jar ./swagger-codegen-cli-3.0.0-rc1.jar generate -i http://localhost:8080/api-docs/openapi.json -l php
# I know it's not supposed to be localhost but it should not be related to the spec.

Steps to reproduce

1. Run the above command

Related issues/PRs

Issue

It generates this invalid code for arrays in PHP:

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

    /**
      * Array of property to format mappings. Used for (de)serialization
      *
      * @var string[]
      */
    protected static $swaggerFormats = [
        'email' => null'first_name' => null'last_name' => null'user_group_id' => 'uuid'
    ];

The commas are missing between key-value pairs.

In some functions for API code, it calls the functions without commas.

    public function getGroupsWithHttpInfo($user_id, $first = null, $max = null)
    {
        $returnType = '\Swagger\Client\Model\InlineResponse20020';
        $request = $this->getGroupsRequest($user_id$first$max); // See the parameters in this line of code.

Suggest a fix/enhancement

Reproduce the issue with the provided OpenAPI schema and the generate -l php command, then inspect the templates or entry points that produce PHP model arrays and API function calls. Done means generated PHP includes commas between array pairs and function arguments and is syntactically valid.