PHP:计算一个 stdClass 对象

问题描述

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.

I have a stdClass object created from json_decode that won't return the right number when I run the count($obj) function. The object has 30 properties, but the return on the count() function is say 1.

有什么想法吗?

以下是其中一个对象的示例.(我从 Twitter 请求每日趋势信息).如果此对象具有多个属性，则 count($obj) 将等于 1.

Below is an example of one of the objects. (I'm requesting the daily trend information from Twitter). If this object had more than one property, the count($obj) would equal 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
                    )

            )
     )

推荐答案

问题是 count 的目的是计算数组中的索引，而不是对象上的属性，(除非它是实现了 Countable 接口的自定义对象).尝试将对象(如下所示)转换为数组，看看是否有帮助.

The problem is that count is intended to count the indexes in an array, not the properties on an object, (unless it's a custom object that implements the Countable interface). Try casting the object, like below, as an array and seeing if that helps.

$total = count((array)$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，它应该在这里完成工作.

Simply casting an object as an array won't always work but being a simple stdClass object it should get the job done here.

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