xml到php数组问题

Question

我的php简单xml对象出了问题。

我的日志中有以下xml数据

SimpleXMLElement Object
(
    [@attributes] => Array
        (
            [title] => test
            [scanner] => Data
            [id] => WordData
            [position] => 1800
            [error] => false
            [num] => 6
        )

    [subpod] => Array
        (
            [0] => SimpleXMLElement Object
                (
                    [@attributes] => Array
                        (
                            [title] => Surnames
                        )

                    [plaintext] => Common (US population: 650 people, white: 63% | black: 35%)
                    [img] => SimpleXMLElement Object
                        (
                            [@attributes] => Array
                                (

                                    [alt] => Common (US population: 650 people, white: 63% | black: 35%)
                                    [title] => Common (US population: 650 people, white: 63% | black: 35%)
                                    [width] => 349
                                    [height] => 18
                                )

                        )

                )

            [1] => SimpleXMLElement Object
                (
                    [@attributes] => Array
                        (
                            [title] => Cities
                        )

                    [plaintext] => Littleton Common (Massachusetts, 2789 people)
                    [img] => SimpleXMLElement Object
                        (
                            [@attributes] => Array
                                (

                                    [alt] => Littleton Common (Massachusetts, 2789 people)
                                    [title] => Littleton Common (Massachusetts, 2789 people)
                                    [width] => 287
                                    [height] => 18
                                )

                        )

                )

            [2] => SimpleXMLElement Object
                (
                    [@attributes] => Array
                        (
                            [title] => Buildings
                        )

                    [plaintext] => Rotunda on Woolwich Common (London, Greater London)
                    [img] => SimpleXMLElement Object
                        (
                            [@attributes] => Array
                                (

                                    [alt] => Rotunda on Woolwich Common (London, Greater London)
                                    [title] => Rotunda on Woolwich Common (London, Greater London)
                                    [width] => 356
                                    [height] => 18
                                )

                        )

                )
              .....more simpleXmlElement object
          )
)

我的php varible $xmlObj = SimpleXMLElement Object但是当我有以下

时

if (is_array($xmlObj->subpod)){
    echo 'is array';    
}else {
    echo 'not array';
}

输出总是'不是数组'，我希望我的代码回显'是数组'

我以为$xmlObj->subpod是一个数组。 当我测试$xmlObj->subpod[0]->plaintext时，它实际上会返回字符串。 我不知道如何解决这个问题。有人可以帮忙吗？

Answer 1

如果你去var_dump($xmlObj->subpod)，你会发现它仍然是SimpleXMLElement个对象。但是，仍然可以将其称为数组。 （请参阅this example之后的注释，该注释暗示该类实现了ArrayAccess，即使类文档没有这样做。）

检查此结构的正确方法是使用SimpleXMLElement::count()：

if ($xmlObj->subpod->count() > 0) { ... }

编辑：您问题中的输出可能来自print_r，有时在输出中无用（例如，当它不是时告诉您某个数组是某个数组）。请尝试使用var_dump，因为它通常对调试更有用。这里唯一需要注意的是，您无法看到SimpleXMLElement对象的整个嵌套对象结构！

Answer 2

在SimpleXMLElement Object内部，一切都是SimpleXMLElement Object，print_r和var_dump有时候是关于数组的 - 它们是可遍历的对象，但你可以对它们执行大多数操作，就好像它们是数组一样。如果您坚持使用纯数组，则可以将此节点强制转换为数组：

$subpod = (array)$xmlObj->subpod;