php5中读写xml文档是非常方便的,我们可以使用php SimpleXML对话来帮我们快速解析与生成xml格式的文件.
创建一个SimpleXML对象有三种方法:
使用new关键字创建,代码如下:
$xml="<personinfo><item><id>1</id><name>aaa</name><age>16</age></item> <item><id>2</id><name>bbb</name><age>26</age></item></personinfo>"; $rss=new SimpleXMLElement($xml); 使用simplexml_load_string()创建,代码如下: $xml="<personinfo><item><id>1</id><name>aaa</name><age>16</age></item> <item><id>2</id><name>bbb</name><age>26</age></item></personinfo>";//开源代码phprm.com $rss=simplexml_load_string($xml); 最常用的方法,使用simplexml_load_file()URL创建,代码如下: $rss=simplexml_load_file("rss.xml");或 $rss=simplexml_load_file("/rss.xml");//远程文档
先看个例子,代码如下:
<?php $xml="<personinfo><item><id>1</id><name>aaa</name><age>16</age></item><item><id>2</id><name>bbb</name><age>26</age></item></personinfo>"; $rss=new SimpleXMLElement($xml); foreach($rss->item as $v){ echo $v->name,'<br />'; } echo $rss->item[1]->age;//读取数据 echo '<hr>'; $rss->item[1]->name='ccc';//修改数据 foreach($rss->item as $v){ echo $v->name,' <br /> ';//aaa <br /> ccc <br /> } echo '<hr>'; unset($rss->item[1]);//输出数据 foreach($rss->item as $k=>$v){ echo $v->name,' <br /> ';//aaa <br /> } echo '<hr>'; //添加数据 $item=$rss->addChild('item'); $item->addChild('id','3'); $item->addChild('name','ccc_new'); $item->addChild('age','40'); foreach($rss->item as $k=>$v){ echo $v->name,' <br /> ';//aaa <br /> ccc_new <br /> } $rss->asXML('personinfo.xml');
xml数据的读取:可以直接通过元素的名称来访问特定的元素,文档中的所有元素都被看成是该对象的属性,实例代码如下:
foreach($rss->item as $v){ echo $v->name,' <br /> ';//aaa <br /> bbb <br /> } echo $rss->item[1]->age;//26
xml数据修改,可以直接利用对象属性赋值的方法来直接编辑一个元素的内容,实例代码如下:
$rss->item[1]->name='ccc';//修改数据 foreach($rss->item as $v){ echo $v->name,' <br /> ';//aaa <br /> ccc <br /> }
可以用php内容函数unset来将一个元素从树中删除,实例代码如下:
unset($rss->item[1]); foreach($rss->item as $v){ echo $v->name,' <br /> ';//a www.phprm.com aa <br /> }
xml添加元素数据,可通过对象的addChild方法来实现,实例代码如下:
$item=$rss->addChild('item'); $item->addChild('id','3'); $item->addChild('name','ccc_new'); $item->addChild('age','40'); foreach($rss->item as $k=>$v){ echo $v->name,' <br /> ';//aaa <br /> ccc_new <br /> }
xml数据的存储:使用对象的asXML()方法
$rss->asXML('personinfo.xml');//将xml数据存储到personinfo.xml文件中.
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