访问对象属性（不进行数组转换即可向下钻取） [英] Accessing Object Properties (Drilling down without array conversion)

问题描述

我最近一直在使用tv_grab_uk_rt来生成电视指南xml文件。我编写了一个脚本，将XML转换为对象，可以循环遍历并插入数据库。在使脚本正常工作的同时，我遇到了一个我希望澄清的问题。

I have recently been working with tv_grab_uk_rt which generates a TV guide xml file. I have written a script to convert the XML into an object which I can the loop through and insert into a database. Whilst I have the script working, I came across an issue I was looking to get clarification for.

将XML放入对象时，我得到以下信息：

When putting the XML to an object I get the following:

SimpleXMLElement Object
(
[@attributes] => Array
    (
        [date] => Mon, 23 Dec 2013 04:30:01 GMT
        [source-info-url] => http://www.radiotimes.com
        [source-info-name] => Radio Times XMLTV Service
        [source-data-url] => http://xmltv.radiotimes.com/xmltv/channels.dat
        [generator-info-name] => XMLTV/0.5.61, tv_grab_uk_rt 1.342, 2011/06/19 06:50:36 
        [generator-info-url] => http://www.xmltv.org
    )

[channel] => Array
    (
        [0] => SimpleXMLElement Object
            (
                [@attributes] => Array
                    (
                        [id] => fiver.channel5.co.uk
                    )

                [display-name] => 5*
                [icon] => SimpleXMLElement Object
                    (
                        [@attributes] => Array
                            (
                                [src] => http://www.lyngsat-logo.com/logo/tv/cc/channel5_star.jpg
                            )

                    )

            )
    )
)

假设我要执行以下操作，则将该对象包含在变量 $ xml 中：

Lets say this object is contained within the variable $xml, if I were to do the following:

foreach($xml->channel as $channel)
{
  echo $channel->displayname
}

我知道我可以回显<$的对象属性c $ c> displayname ，在这种情况下为 5 * 。

I realise I would be able to echo the object property of displayname, in this case 5*.

但是会发生什么如果我想说回声 src 在这种情况下为 http://www.lyngsat-logo.com/logo/tv/cc/channel5_star。 jpg ，我该如何处理一个对象。例如，我不能

But what happens if I wanted to say echo the src in this case http://www.lyngsat-logo.com/logo/tv/cc/channel5_star.jpg, how would I go about doing this with an object. I can't for example do

foreach($xml->channel as $channel)
{
  echo $channel->icon->@attributes->src
}

例如使用数组，您可以轻松地完成

With arrays for example you could easily do

foreach($xml['channel'] as $channel)
{
  echo $channel['icon']['@attributes']['src'];
}

但不包含对象。而不是陷入无限循环，我发现我可以将对象转换成这样的数组

But not with objects. Rather than getting into endless loops I found I could convert the object to an array like so

 foreach($xml->channel as $channel)
{
  echo $channel['icon']['@attributes']['src'];
  $channelArray = get_object_vars($channel);
}

然后，我可以简单地以数组形式访问属性。
所以我的问题确实是，没有将对象转换为数组，有没有一种方法可以深入研究属性，即

Then I can simply access the properties as an array. So my question really is, without converting the object into an array, is there a way to drill into the properties ie

$xml->channel->0->displayname

推荐答案

每个频道是 SimpleXMLElement 实例，这样您就可以

Each channel is a SimpleXMLElement instance so you can

foreach($xml->channel as $channel)
{
  echo $channel->icon->attributes()->src;
}

如有疑问，请始终从官方文档入手。

When in doubt always start from the official docs.

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