php中simplexml_load_string使用实例

作者：袖梨 2022-06-24

先用一段代码重现一下问题

乍一看，结果很让人费解：

 代码如下 复制代码

$string = <<
hello
world

EOF;

$data = simplexml_load_string($string);

print_r($data);
print_r($data->foo);
?>

乍一看，结果很让人费解：

 代码如下 复制代码

SimpleXMLElement Object
(
[foo] => Array
(
[0] => SimpleXMLElement Object
(
[bar] => hello
)
[1] => SimpleXMLElement Object
(
[bar] => world
)
)
)
SimpleXMLElement Object
(
[bar] => hello
)

明明print_r显示foo是一个有两个bar元素的数组，但是最后却仅仅显示了一个bar元素！
原因其实很简单，在如上所示simplexml_load_string的结果里，foo并不是数组，而是一个迭代对象！
可以这样确认：

 代码如下 复制代码

foreach ($data->foo as $v) print_r($v);
foreach ($data->children() as $v) print_r($v);

看来，print_r或者var_dump之类的表象并不完全可信，自己多留心吧。

假如我们获取的XML数据如下：（可以使用curl、fsockopen等方式获取）

 代码如下 复制代码


 你好
 
 Array；Array；Array；
 
  Haven't seen you for a long time. How are you?
  多日不见了，你好吗？
 
 
  Hello! How are you?
  嘿，你好？
 
 
  Hello, Brooks!How are you?
  喂，布鲁克斯！你好吗？
 
 
  Hi, Barbara, how are you?
  嘿，芭芭拉，你好吗？
 
 
  How are you? -Quite well, thank you.
  你好吗？-很好，谢谢你。
 

经过simplexml_load_string得到：

 代码如下 复制代码

SimpleXMLElement Object
(
    [@attributes] => Array
        (
            [num] => 219
            [id] => 219
            [name] => 219
        )

    [key] => 你好www.111cn.Net
    [pos] => SimpleXMLElement Object
        (
        )

    [acceptation] => Array；Array；Array；
    [sent] => Array
        (
            [0] => SimpleXMLElement Object
                (
                    [orig] => Haven't seen you for a long time. How are you?
                    [trans] => 多日不见了，你好吗？
                )

            [1] => SimpleXMLElement Object
                (
                    [orig] => Hello! How are you?
                    [trans] => 嘿，你好？
                )

            [2] => SimpleXMLElement Object
                (
                    [orig] => Hello, Brooks!How are you?
                    [trans] => 喂，布鲁克斯！你好吗？
                )

            [3] => SimpleXMLElement Object
                (
                    [orig] => Hi, Barbara, how are you?
                    [trans] => 嘿，芭芭拉，你好吗？
                )

            [4] => SimpleXMLElement Object
                (
                    [orig] => How are you? -Quite well, thank you.
                    [trans] => 你好吗？-很好，谢谢你。
                )

        )

)


我们在PHP语言中可以用以下方法取得我们想要的值：

 代码如下 复制代码

$data = <<

 你好
 
 Array；Array；Array；
 
  Haven't seen you for a long time. How are you?
  多日不见了，你好吗？
 
 
  Hello! How are you?
  嘿，你好？
 
 
  Hello, Brooks!How are you?
  喂，布鲁克斯！你好吗？
 
 
  Hi, Barbara, how are you?
  嘿，芭芭拉，你好吗？
 
 
  How are you? -Quite well, thank you.
  你好吗？-很好，谢谢你。
 

XML;
$xmldata = simplexml_load_string($data);
header("Content-Type: text/html; charset=UTF-8");
print_r($xmldata);
echo "
".trim($xmldata->sent[0]->orig); //Haven't seen you for a long time. How are you?
echo "
".trim($xmldata->key); //你好
?>

 

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