How to implement the url

Hello everyone and forgive my ignorance, I am new to the forum.
I'm scraping facebook fan pages on php and I see in all comments data like this:

Sitemap:
{"_id":"movie","startUrl":["[https://www.facebook.com/groups/1421535114773364/members/"],"selectors":{"id":"link_profile","type":"SelectorLink","parentSelectors":["_root"],"selector":"#u_fetchstream_8_g .fbProfileBrowserListContainer > ul ._60ri a","multiple":true,"delay":0},{"id":"load_more","type":"SelectorElementScroll","parentSelectors":["link_profile"],"selector":"#u_fetchstream_8_g .fbProfileBrowserListContainer > ul","multiple":true,"delay":0}]}

How could I implement this data whit PHP?

Right now my way of scraping is simply with file_get_contensl("https://www.facebook.com");