我有一个从 json_decode 创建的 stdClass 对象，当我运行 count($obj) 函数时，它不会返回正确的数字。该对象有 30 个属性，但 count() 函数的返回值是 1。
有什么想法吗？
以下是其中一个对象的示例。 (我正在从 Twitter 请求每日趋势信息)。如果该对象具有多个属性，则 count($obj) 将等于 1。
[trends] => stdClass Object
(
[2009-08-21 11:05] => Array
(
[0] => stdClass Object
(
[query] => "Follow Friday"
[name] => Follow Friday
)
[1] => stdClass Object
(
[query] => "Inglourious Basterds" OR "Inglorious Basterds"
[name] => Inglourious Basterds
)
[2] => stdClass Object
(
[query] => Inglourious
[name] => Inglourious
)
[3] => stdClass Object
(
[query] => #songsincode
[name] => #songsincode
)
[4] => stdClass Object
(
[query] => #shoutout
[name] => #shoutout
)
[5] => stdClass Object
(
[query] => "District 9"
[name] => District 9
)
[6] => stdClass Object
(
[query] => #howmanypeople
[name] => #howmanypeople
)
[7] => stdClass Object
(
[query] => Ashes OR #ashes
[name] => Ashes
)
[8] => stdClass Object
(
[query] => #youtubefail
[name] => #youtubefail
)
[9] => stdClass Object
(
[query] => TGIF
[name] => TGIF
)
[10] => stdClass Object
(
[query] => #wish09
[name] => #wish09
)
[11] => stdClass Object
(
[query] => #watch
[name] => #watch
)
[12] => stdClass Object
(
[query] => Avatar
[name] => Avatar
)
[13] => stdClass Object
(
[query] => Ramadhan
[name] => Ramadhan
)
[14] => stdClass Object
(
[query] => Goodnight
[name] => Goodnight
)
[15] => stdClass Object
(
[query] => iPhone
[name] => iPhone
)
[16] => stdClass Object
(
[query] => #iranelection
[name] => #iranelection
)
[17] => stdClass Object
(
[query] => Apple
[name] => Apple
)
[18] => stdClass Object
(
[query] => "Usain Bolt"
[name] => Usain Bolt
)
[19] => stdClass Object
(
[query] => H1N1
[name] => H1N1
)
)
)
最佳答案
问题在于 count 旨在计算数组中的索引，而不是对象上的属性(除非它是实现 Countable 接口(interface)的自定义对象)。尝试将对象转换为数组，如下所示，看看是否有帮助。
$total = count((array)$obj);
简单地将对象转换为数组并不总是有效，但作为一个简单的 stdClass 对象，它应该可以在这里完成工作。
关于PHP:计算一个 stdClass 对象，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/1314745/