Whenever you want to access multidimensional arrays or properties of a property in string, you have to enclose this access with {}. Otherwise PHP will only parse the variable up to the first [i] or ->property.

因此，对于"$this->author->last"而不是"{$this->author->last}"，PHP将仅分析和评估$this->author，这会给您错误，因为author是对象.

So with "$this->author->last" instead of "{$this->author->last}", PHP will only parse and evaluate $this->author which gives you the error as author is an object.

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