php中simplexml_load_string使用实例
发布:smiling 来源: PHP粉丝网 添加日期:2014-08-20 11:14:28 浏览: 评论:0
在php中simplexml_load_string() 函数把 XML 字符串载入对象中,下面我来给大家介绍几个简单实例的同时也介绍在使用simplexml_load_string的一些需要注意的事项.
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:
- <?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);
- ?>
- SimpleXMLElement Object
- (
- [foo] => Array
- (
- [0] => SimpleXMLElement Object
- (
- [bar] => hello
- )
- [1] => SimpleXMLElement Object
- (
- [bar] => world
- )
- ) //开源代码phpfensi.com
- )
- 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,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:
- <?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得到如下代码:
- SimpleXMLElement Object
- (
- [@attributes] => Array
- (
- [num] => 219
- [id] => 219
- [name] => 219
- )
- [key] => 你好www.phpfensi.com
- [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:
- <?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
- ?>
Tags: simplexml_load_string php使用实例
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