JSON Parsing with PHP

问题

I have the following JSON content that I'm pulling from a service feed:

[
   {
      "global_event":{
         "ending_at":"2011-11-07T02:00:00Z",
         "short_url":"http://bit.ly/reAhRw",
         "created_at":"2011-10-04T14:25:41Z",
         "event_responses":[

         ],
         "addresses":{
            "location":{
               "city":"blah",
               "latitude":30.205288,
               "zipcode":"343434",
               "street":"blah",
               "longitude":-95.475289,
               "state":"TX"
            }
         },
         "body":"blahblahblah",
         "euid":"2f489d0c82d167f1c16aba5d3b4c29ade6f1d52a",
         "title":"Fusion",
         "updated_at":"2011-10-04T14:26:57Z",
         "event_roles":[

         ],
         "user":{
            "long_name":"Fusion Single",
            "nickname":""
         },
         "event_items":[

         ],
         "starting_at":"2011-11-07T00:00:00Z"
      }
   }
]

I've tried the following code to parse it to no avail:

$json = @file_get_contents('jsonfeed');
$feed = json_decode($json);

foreach($feed->global_event as $item) {
            $rss_item = array(
                'title' => $item->title,
                'link' => $item->short_url,
                'author' => $item->long_name,
                'content' => $item->body,
                'date' => $item->updated_at,
                'type' => 'Woodlands Church'
            );
            array_push($this->rss, $rss_item);  
        }

The final array that is created $this->rss never has anything in it and is just a null array. Any ideas?

回答1:

In JSON, curly brackets ("{" and "}") define objects, not arrays. Angle brackets define arrays.

so $feed is an array, containing 1 object with 1 property called global_event.

the loop should be:

$feed = json_decode($json);
foreach($feed as $obj) {
    $item = $obj->global_event;

    $rss_item = array(
        'title' => $item->title,
        'link' => $item->short_url,
        'author' => $item->long_name,  
        'content' => $item->body,
        'date' => $item->updated_at, 
        'type' => 'Woodlands Church'
    );
    array_push($this->rss, $rss_item);  
}

回答2:

You need to parse it this way:

<?php

$json = @file_get_contents("jsonfeed");
$feed = json_decode($json);

foreach($feed as $item) {
    // your code, accessing everything by using
    // $item->global_event->PROPERTY
}

?>

because at the beginning of your foreach loop your $feed variable looks like this:

Array
(
[0] => stdClass Object
    (
        [global_event] => stdClass Object
            (
                [ending_at] => 2011-11-07T02:00:00Z
                [short_url] => http://bit.ly/reAhRw
                [created_at] => 2011-10-04T14:25:41Z
                [event_responses] => Array
                    (
                    )

                [addresses] => stdClass Object
                    (
                        [location] => stdClass Object
                            (
                                [city] => blah
                                [latitude] => 30.205288
                                [zipcode] => 343434
                                [street] => blah
                                [longitude] => -95.475289
                                [state] => TX
                            )

                    )

                [body] => blahblahblah
                [euid] => 2f489d0c82d167f1c16aba5d3b4c29ade6f1d52a
                [title] => Fusion
                [updated_at] => 2011-10-04T14:26:57Z
                [event_roles] => Array
                    (
                    )

                [user] => stdClass Object
                    (
                        [long_name] => Fusion Single
                        [nickname] => 
                    )

                [event_items] => Array
                    (
                    )

                [starting_at] => 2011-11-07T00:00:00Z
            )

    )

)

Make sure to pay attention to what's an object and what's an array so you use the appropriate methods to access the data (so, objects with -> notation and arrays with [] notation).

来源：https://stackoverflow.com/questions/7889738/json-parsing-with-php