【发布时间】：2013-07-05 06:44:52
【问题描述】：
我知道这可能很简单，我开始明白我需要如何去做，我意识到这与 OO 有关，但是因为我是 OO 的新手，而 json 我遇到了一些问题有了这个http://api.discogs.com/database/search?q=d&page=1&per_page=5，它返回5个结果，查询d以json格式返回，所以我用php函数解析它，然后尝试让我们说显示第一个结果的缩略图这是我的解析代码：
$returnData = file_get_contents($queryURL);
$discogsJSON = json_decode($returnData);
其中$queryURL = 提供的网址。如果我打印 $discogsJSON 我得到这个：
<pre>stdClass Object
(
[pagination] => stdClass Object
(
[per_page] => 5
[items] => 179465
[page] => 1
[urls] => stdClass Object
(
[last] => http://api.discogs.com/database/search?q=f&per_page=5&page=35893
[next] => http://api.discogs.com/database/search?q=f&per_page=5&page=2
)
[pages] => 35893
)
[results] => Array
(
[0] => stdClass Object
(
[style] => Array
(
[0] => Free Jazz
)
[thumb] => http://api.discogs.com/image/R-90-1672955-1305426452.jpeg
[format] => Array
(
[0] => Vinyl
[1] => LP
[2] => Album
)
[country] => Switzerland
[title] => Steve Lacy - Clinkers
[uri] => /Steve-Lacy-Clinkers/master/54331
[label] => Array
(
[0] => Hat Hut Records
)
[catno] => F
[year] => 1978
[genre] => Array
(
[0] => Jazz
)
[resource_url] => http://api.discogs.com/masters/54331
[type] => master
[id] => 54331
)
[1] => stdClass Object
(
[style] => Array
(
[0] => Free Jazz
)
[thumb] => http://api.discogs.com/image/R-90-1672955-1305426452.jpeg
[format] => Array
(
[0] => Vinyl
[1] => LP
[2] => Album
)
[country] => Switzerland
[title] => Steve Lacy - Clinkers
[uri] => /Steve-Lacy-Clinkers/release/1672955
[label] => Array
(
[0] => Hat Hut Records
)
[catno] => F
[year] => 1978
[genre] => Array
(
[0] => Jazz
)
[resource_url] => http://api.discogs.com/releases/1672955
[type] => release
[id] => 1672955
)
[2] => stdClass Object
(
[style] => Array
(
[0] => Alternative Rock
[1] => Goth Rock
[2] => Heavy Metal
)
[thumb] => http://api.discogs.com/image/R-90-2785283-1300918365.jpeg
[format] => Array
(
[0] => CD
[1] => Compilation
[2] => Unofficial Release
)
[country] => Russia
[title] => HIM (2) - Overload Hits
[uri] => /HIM-Overload-Hits/release/2785283
[label] => Array
(
[0] => FullHouse Records
)
[catno] => F?????
[year] => 2003
[genre] => Array
(
[0] => Rock
)
[resource_url] => http://api.discogs.com/releases/2785283
[type] => release
[id] => 2785283
)
[3] => stdClass Object
(
[style] => Array
(
[0] => Drone
[1] => Ambient
)
[thumb] => http://api.discogs.com/image/R-90-3108621-1316178067.jpeg
[format] => Array
(
[0] => CDr
[1] => Album
[2] => Limited Edition
)
[country] => Russia
[title] => Solar Ocean - Twillight October
[uri] => /Solar-Ocean-Twillight-October/release/3108621
[label] => Array
(
[0] => Necrophone
)
[catno] => F
[year] => 2010
[genre] => Array
(
[0] => Electronic
)
[resource_url] => http://api.discogs.com/releases/3108621
[type] => release
[id] => 3108621
)
[4] => stdClass Object
(
[style] => Array
(
[0] => Techno
[1] => Electro
[2] => Tech House
[3] => Minimal
)
[thumb] => http://api.discogs.com/image/R-90-699054-1161976299.jpeg
[format] => Array
(
[0] => Vinyl
[1] => 12"
[2] => Box Set
[3] => Compilation
[4] => Limited Edition
)
[country] => Germany
[title] => Various - Cocoon Compilation F
[uri] => /Various-Cocoon-Compilation-F/master/33655
[label] => Array
(
[0] => Cocoon Recordings
[1] => Cocoon Compilation
)
[catno] => COR LP 011
[year] => 2006
[genre] => Array
(
[0] => Electronic
)
[resource_url] => http://api.discogs.com/masters/33655
[type] => master
[id] => 33655
)
)
)
</pre>
这是完全正确的，我可以看到我想要的所有数据，但是当我尝试访问（比如说第一个的缩略图）时：
echo $discogsJSON['results']['0']['thumb'];
我留下了：Fatal error: Cannot use object of type stdClass as array
我想从这里有足够的信息来构建正确的 echo 语句，但是谁能向我解释正确获取数据方法背后的 OO 理论？
【问题讨论】：