php中simplexml_load_string使用執行個體分享_PHP教程

先用一段代碼重現一下問題

乍一看，結果很讓人費解：

複製代碼 代碼如下:
$string = <<
hello
world

EOF;

$data = simplexml_load_string($string);

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

乍一看，結果很讓人費解：

複製代碼 代碼如下:
SimpleXMLElement Object
(
[foo] => Array
(
[0] => SimpleXMLElement Object
(
[bar] => hello
)
[1] => SimpleXMLElement Object
(
[bar] => world
)
)
)
SimpleXMLElement Object
(
[bar] => hello
)

明明print_r顯示foo是一個有兩個bar元素的數組，但是最後卻僅僅顯示了一個bar元素！
原因其實很簡單，在如上所示simplexml_load_string的結果裡，foo並不是數組，而是一個迭代對象！
可以這樣確認：

複製代碼 代碼如下:
foreach ($data->foo as $v) print_r($v);
foreach ($data->children() as $v) print_r($v);

看來，print_r或者var_dump之類的表象並不完全可信，自己多留心吧。

假如我們擷取的XML資料如下：（可以使用curl、fsockopen等方式擷取）

複製代碼 代碼如下:


你好

Array；Array；Array；

Haven't seen you for a long time. How are you?
多日不見了，你好嗎？


Hello! How are you?
嘿，你好？


Hello, Brooks!How are you?
喂，布魯克斯！你好嗎？


Hi, Barbara, how are you?
嘿，芭芭拉，你好嗎？


How are you? -Quite well, thank you.
你好嗎？-很好，謝謝你。

經過simplexml_load_string得到：

複製代碼 代碼如下:
SimpleXMLElement Object
(
[@attributes] => Array
(
[num] => 219
[id] => 219
[name] => 219
)

[key] => 你好
[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] => 多日不見了，你好嗎？
)

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

[2] => SimpleXMLElement Object
(
[orig] => Hello, Brooks!How are you?
[trans] => 喂，布魯克斯！你好嗎？
)

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

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

)

)

我們在PHP語言中可以用以下方法取得我們想要的值：

複製代碼 代碼如下:
$data = <<

你好

Array；Array；Array；

Haven't seen you for a long time. How are you?
多日不見了，你好嗎？


Hello! How are you?
嘿，你好？


Hello, Brooks!How are you?
喂，布魯克斯！你好嗎？


Hi, Barbara, how are you?
嘿，芭芭拉，你好嗎？


How are you? -Quite well, thank you.
你好嗎？-很好，謝謝你。


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
?>

http://www.bkjia.com/PHPjc/735236.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/735236.htmlTechArticle先用一段代碼重現一下問題 乍一看，結果很讓人費解： 複製代碼 代碼如下: ?php $string = EOF data foobarhello/bar/foo foobarworld/bar/foo /data EOF; $dat...

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