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php中simplexml_load_string使用

程序员文章站 2022-05-12 09:12:25
...
  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

$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

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

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


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, *s!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

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, *s!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

$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, *s!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
?>