[PHP] enum values generated without comma

[that-guy-iain]

Description

Enums returns invalid code

public function getFailureReasonAllowableValues()
    {
        return [
            self::FAILURE_REASON_EXPIRED_CARD
            self::FAILURE_REASON_INVALID_DETAILS
            self::FAILURE_REASON_FRAUD
            self::FAILURE_REASON_AUTHENTICATION_REQUIRED
            self::FAILURE_REASON_INVALID_CARD
            self::FAILURE_REASON_GENERAL_DECLINE
            self::FAILURE_REASON_CONTACT_PROVIDER
            self::FAILURE_REASON_LACK_OF_FUNDS
        ];
    }

Swagger-codegen version

Swagger-codegen-v3 docker:latest

Swagger declaration file content or url

description: Payment response
content:
  application/json:
    schema:
      type: object
      properties:
        paid:
          type: boolean
        failure_reason:
          type: string
          nullable: true
          enum: [expired_card, invalid_details, fraud, authentication_required, invalid_card, general_decline, contact_provider, lack_of_funds]

Command line used for generation

docker run --rm -v ${PWD}:/local swaggerapi/swagger-codegen-cli-v3:latest generate     -i /local/openapi.yaml     -l php     -o /local/out/php --invoker-package=BillaBear --git-user-id=billabear --git-repo-id=php-sdk

Related issues/PRs

This appears to be related #12404