How do I use php to pull in json from a url for use as a variable? [closed]

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I have a url where json is being dynamically loaded. I need to use php to pull in that json and use json_decode to get the info out of it. So far I have not been able to figure out how to get the actual json into my php. What is it that I need to do? Is there a "content" command for php?

Right now I'm trying:

print(json_decode('http://theurl开发者_如何学JAVA.com'));

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echo json_decode(file_get_contents('http://theurl.com'));

You can also use cURL instead of file_get_contents for some extra speed and control, but it's relatively complicated to compared to file_get_contents, especially if you've never used it before.