php中simplexml_load_string使用執行個體分享_php執行個體

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>
<foo><bar>hello</bar></foo>
<foo><bar>world</bar></foo>
</data>
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:

<?xml version="1.0" encoding="UTF-8"?>
<dict num="219" id="219" name="219">
 <key>你好</key>
 <pos></pos>
 <acceptation>Array；Array；Array；</acceptation>
 <sent>
  <orig>Haven't seen you for a long time. How are you?</orig>
  <trans>多日不見了，你好嗎？</trans>
 </sent>
 <sent>
  <orig>Hello! How are you?</orig>
  <trans>嘿，你好？</trans>
 </sent>
 <sent>
  <orig>Hello, Brooks!How are you?</orig>
  <trans>喂，布魯克斯！你好嗎？</trans>
 </sent>
 <sent>
  <orig>Hi, Barbara, how are you?</orig>
  <trans>嘿，芭芭拉，你好嗎？</trans>
 </sent>
 <sent>
  <orig>How are you? -Quite well, thank you.</orig>
  <trans>你好嗎？-很好，謝謝你。</trans>
 </sent>
</dict>

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:

<?php
$data = <<<XML
<?xml version="1.0" encoding="UTF-8"?>
<dict num="219" id="219" name="219">
 <key>你好</key>
 <pos></pos>
 <acceptation>Array；Array；Array；</acceptation>
 <sent>
  <orig>Haven't seen you for a long time. How are you?</orig>
  <trans>多日不見了，你好嗎？</trans>
 </sent>
 <sent>
  <orig>Hello! How are you?</orig>
  <trans>嘿，你好？</trans>
 </sent>
 <sent>
  <orig>Hello, Brooks!How are you?</orig>
  <trans>喂，布魯克斯！你好嗎？</trans>
 </sent>
 <sent>
  <orig>Hi, Barbara, how are you?</orig>
  <trans>嘿，芭芭拉，你好嗎？</trans>
 </sent>
 <sent>
  <orig>How are you? -Quite well, thank you.</orig>
  <trans>你好嗎？-很好，謝謝你。</trans>
 </sent>
</dict>
XML;
$xmldata = simplexml_load_string($data);
header("Content-Type: text/html; charset=UTF-8");
print_r($xmldata);
echo "<br />".trim($xmldata->sent[0]->orig); //Haven't seen you for a long time. How are you?
echo "<br />".trim($xmldata->key); //你好
?>