need help how do i get response from php just like this?

It's my wishes { "worldpopulation": [ { "rank":1,"country":"China", "population":"1,354,040,000", "flag":"http://ift.tt/1k4xoyg" },

     {
     "rank":2,"country":"India",
     "population":"1,210,193,422",
     "flag":"http://ift.tt/1kKjA0k"
     }, 

     {
     "rank":3,"country":"United States",
     "population":"315,761,000",
     "flag":"http://www.androidbegin.com/tutorial/flag/unitedstates.png"
     }, 

     {
     "rank":4,"country":"Indonesia",
     "population":"237,641,326",
     "flag":"http://ift.tt/1gnVIs0"
     }, 

     {
     "rank":5,"country":"Brazil",
     "population":"193,946,886",
     "flag":"http://ift.tt/1kKjxlh"
     }, 

     {
     "rank":6,"country":"Pakistan",
     "population":"182,912,000",
     "flag":"http://ift.tt/1kKjxlj"
     }, 

     {
     "rank":7,"country":"Nigeria",
     "population":"170,901,000",
     "flag":"http://ift.tt/1gnVIIk"
     }, 

     {
     "rank":8,"country":"Bangladesh",
     "population":"152,518,015",
     "flag":"http://ift.tt/1kKjA0v"
     }, 

     {
     "rank":9,"country":"Russia",
     "population":"143,369,806",
     "flag":"http://ift.tt/1o2k91J"
     }, 

     {
     "rank":10,"country":"Japan",
     "population":"127,360,000",
     "flag":"http://ift.tt/1kKjxBB"
     } 
] 

} http://ift.tt/LA6KRN