php中simplexml_load_string使用实例分享

 更新时间:2014年02月13日 15:40:19   作者:   我要评论

这篇文章主要介绍了php中simplexml_load_string使用实例,需要的朋友可以参考下

先用一段代码重现一下问题

乍一看,结果很让人费解:

复制代码 代码如下:

<?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,结果很让人费解:

复制代码 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:

复制代码 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)

复制代码 代码如下:

<?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>多日不见了,你好吗?</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,布鲁克斯!你好吗?</trans>
 </sent>
 <sent>
  <orig>Hi, Barbara, how are you?</orig>
  <trans>嘿,芭芭拉,你好吗?</trans>
 </sent>
 <sent>
  <orig>How are you? -Quite well, thank you.</orig>
  <trans>你好吗?-很好,谢谢你。</trans>
 </sent>
</dict>

经过simplexml_load_string得到:

复制代码 代码如下:

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:

复制代码 代码如下:

<?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>多日不见了,你好吗?</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,布鲁克斯!你好吗?</trans>
 </sent>
 <sent>
  <orig>Hi, Barbara, how are you?</orig>
  <trans>嘿,芭芭拉,你好吗?</trans>
 </sent>
 <sent>
  <orig>How are you? -Quite well, thank you.</orig>
  <trans>你好吗?-很好,谢谢你。</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
?>

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