jquery - Send data to a site to obtain a Json with php -

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I'm having any problem, this is the thing that I was reading a json file with jquery, and it's good The way I was working, but now I have to read it in PHP, but this is that I am using some data to get some parts of JSON: 

  Datastring = "id =" + id + "& Todos =" + false; $ .ajax ({type: "post", url: "http://www.url.com/example", data: datestring, datatype: "jason", success: function (data, textstate, jxaxhr) {< Code>  
 And I did not have any problems with it, because I was sending data to the site so it gave me the information that I want, but I do not know how to do it in PHP, I was trying  
  $ str = file_get_contents ('http://www.url.com/example.json'); $ json = json_decode ($ str, true) var_dump ($ Take  
  
 
 And of course this site is not returning me because I am not sending data  
 I hope there is a way. Thanks!

You should use the curl or fsockopen if it is not current and can not be enabled (too much Rare case).

How do you do curl 

  with

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