How does PHP query the array stored in MongoDB?

The problem I'm encountering is someone else mongodb storing the picture information in key , for img , value an url array.
When I use php an mongodb extension to query, the img field returns a string, but what I want to get is the array object that was deposited, what method can I get to an object of an array type?
My query is using MongoCursor::find() this API. NoSQL database I was also the first time to use ╮ (╯-╰) ╭.

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The problem I'm encountering is someone else mongodb storing the picture information in key , for img , value an url array.
When I use php an mongodb extension to query, the img field returns a string, but what I want to get is the array object that was deposited, what method can I get to an object of an array type?
My query is using MongoCursor::find() this API. NoSQL database I was also the first time to use ╮ (╯-╰) ╭.

I didn't use it.过可以试下 存的时候 json_encode(), 取出来后在json_decode()

