为什么在实体构造函数中使用setter或field键会得到不同的结果？

Question

Here is a dump of a new instance of my entity Theme, when using $this->type = 'theme'; in the __construct function.

ExplorerController.php on line 197:
Theme {#450 ▼
  -id: null
  -headings: ArrayCollection {#449 ▶}
  -infos: null
  -base: null
  -deletedAt: null
  -key: null
  -description: null
  -type: null
  +"type": "theme"
}

I don't understand why the last field type appears twice, first with a null value, and then between quotes with a "plus" sign in front.

If I use the setter $this->setType('theme'); then the result is as expected:

ExplorerController.php on line 197:
Theme {#450 ▼
  -id: null
  -headings: ArrayCollection {#449 ▶}
  -infos: null
  -base: null
  -deletedAt: null
  -key: null
  -description: null
  -type: "theme"
}

I guess it has to do with proxies, but this a subject I don't fully understand.

Could someone explain what's happening here?

Answer 1

• A dash in front of type indicates it's a private member.
• A plus indicates a public member.

By explicitly setting $this->type, you are setting the public member.

Without actually seeing your code, I cannot offer any other advice except to make sure you are not defining $type twice (maybe in an extended class or trait?).