如何在PHP中解析此JSON？

I am trying to just get the values of MediaUrl (meaning just the URL) into an array of strings with JSON on PHP. I want to ignore everything else. Here is what is returning from the URL I call. What do I need to do in PHP to get these values into an array?

{
  "d": {
    "results": [
     {
       "__metadata":
       {
         "uri": "https://api.datamarket.azure.com/Data.ashx/Bing/Search/Image?Query='12 monkeys blu-ray'&$skip=0&$top=1",
         "type": "ImageResult"
       },
       "MediaUrl": "http://www.dvdlink.ca/images/Movies%20Covers/9779/47/1250724527_1250911533.jpg",
       "Thumbnail": {
         "__metadata": {
         "type": "Bing.Thumbnail"
       },
         "MediaUrl": "http://ts4.mm.bing.net/th?id=HN.607991009242185763&pid=15.1",
         "FileSize": "10424"
       }
     },
     {
       "__metadata": {
         "uri": "https://api.datamarket.azure.com/Data.ashx/Bing/Search/Image?Query='12 monkeys blu-ray'&$skip=1&$top=1",
         "type": "ImageResult"
        },
        "MediaUrl": "http://www.bluray-dvd-film-shop.at/media/images/popup/12-Monkeys-bluray.jpg",
        "Thumbnail": {
          "__metadata": {
            "type": "Bing.Thumbnail"
          },
          "MediaUrl": "http://ts4.mm.bing.net/th?id=HN.608017534956014467&pid=15.1",
          "FileSize": "17060"
         }
        }
      ],
      "__next": "https://api.datamarket.azure.com/Data.ashx/Bing/Search/Image?Query='12%20monkeys%20blu-ray'&$skip=50"
    }
  }

$result = array();
$array = json_decode($your_json_string, true);
    foreach ($array['d']['results'] as $entry)
        $result[] = $entry['MediaUrl'];

Everything you need is not in $result array, and if the are no results (missing MediaUrl), empty($result) will return TRUE.

You can do as

json_decode($data,true);

This will give you an array and you can loop though the array to fetch the data.

$data = 'Your JSON string' ;

Here is the manual http://in2.php.net/json_decode