[php] Question on schema->class Name

Hi there,

My OpenAPI schema looks like this:

...
      "200": {
            "description": "successful operation",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/_default"
                }
              }
            }
          },
....
  "components": {
    "schemas": {
      "_default": {
        "type": "object",
        "title": "DefaultResponse",
        "properties": {
          "msg": {
            "type": "string",
            "description": "Message to return on routes, without response data",
            "example": "done"
          }
        }
      },
...

Which results in invalid PHP Code:

class Default implements ModelInterface, ArrayAccess, \JsonSerializable
{
....
    protected static $openAPIModelName = '_default';
...

Of course "default" is reserved in PHP, but my actual Schema is not called "default".
Is there a way to use the title "DefaultResponse" as Class-Name?

Thanks a lot!

Reproduce the generated PHP model from the OpenAPI schema shown in the issue, focusing on the interaction between the _default schema name and its DefaultResponse title. Inspect the PHP generator's model naming behavior and determine a valid class-name outcome; done means the generated PHP is valid and the schema title is used when appropriate.