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How to read JSON response in PHP


<?php
    $json='{
        "stat": "ok",
        "profile": {
            "providerName": "testing",
            "identifier": "http://testing.com/58263223",
            "displayName": "testing",
            "preferredUsername": "testing",
            "name": {
            "formatted": "testing"
            },
            "url": "http://testing.com/testing/",
            "photo": "https://securecdn.testing.com/uploads/users/5826/3223/avatar32.jpg?1373393837",
            "providerSpecifier": "testing"
        }
        }';


        $data=json_decode($json ,true);
        $preferredUsername=$data['profile']['preferredUsername'];
        $displayName=$data['profile']['displayName'];
?>