[BUG] [php-nextgen] Nullable mixed type is not allowed

[lucajung]

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

The generated client has an optional mixed type. Mixed already contains null values.
PHP Fatal error: Type mixed cannot be marked as nullable since mixed already includes null

/**
 * Operation setValue
 *
 * @param  mixed|null $body body (optional)
 * 
 * @throws ApiException
 * @return ApiResult
 */
public function setValue(?mixed $body = null): ApiResult
{
  list($response) = $this->setValueWithHttpInfo($body);
  return $response;
}

openapi-generator version

7.10.0

OpenAPI declaration

"/api/value": {
    "post": {
        "tags": [
            "Value"
        ],
        "operationId": "SetValue",
        "parameters": [],
        "requestBody": {
            "content": {
                "application/json": {
                    "schema": {}
                }
            }
        },
        "responses": {
            "200": {
                "description": "OK",
                "content": {
                    "application/json": {
                        "schema": {
                            "$ref": "#/components/schemas/ApiResponse"
                        }
                    },
                }
            },
            "401": {
                "description": "Unauthorized"
            },
            "403": {
                "description": "Forbidden"
            }
        },
        "security": [
            {
                "apiKey": [
                    "Key"
                ],
            }
        ]
    }
},

Generation Details

• x

Steps to reproduce

Create the PHP API client with optional POST body

Related issues/PRs

• x

Suggest a fix

Remove the ? if the type is mixed.

[lucajung]

It has been found that this is only the case if the endpoint does not accept valid JSON. In this case, simply “string”. Nevertheless, the generator should be able to generate error-free php code.