Home Backend Development PHP Tutorial php的SimpleXML方法读写XML接口文件实例解析_php技巧

php的SimpleXML方法读写XML接口文件实例解析_php技巧

May 17, 2016 am 08:42 AM
php

在php5中读写xml文档是非常方便的,可以直接使用php的SimpleXML方法来快速解析与生成xml格式的文件,下面举例说明:

创建一个SimpleXML对象有三种方法:

1.使用new关键字创建

复制代码 代码如下:

$xml="1aaa16
2bbb26
";
$rss=new SimpleXMLElement($xml);

2.使用simplexml_load_string()创建

复制代码 代码如下:

$xml="1aaa16
2bbb26
";
$rss=simplexml_load_string($xml);

3.使用simplexml_load_file()从一个URL创建

复制代码 代码如下:

$rss=simplexml_load_file("rss.xml");
//或者:
$rss=simplexml_load_file("/rss.xml");//远程文档

具体实例如下:

复制代码 代码如下:

$xml="1aaa162bbb26";
$rss=new SimpleXMLElement($xml);
foreach($rss->item as $v){
 echo $v->name,'
';
}
echo $rss->item[1]->age;//读取数据
echo '
';
$rss->item[1]->name='ccc';//修改数据
foreach($rss->item as $v){
 echo $v->name,'
';//aaa
ccc

}
echo '
';
unset($rss->item[1]);//输出数据
foreach($rss->item as $k=>$v){
 echo $v->name,'
';//aaa

}
echo '
';
//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,'
';//aaa
ccc_new

}
$rss->asXML('personinfo.xml');
?>

进一步分析上面例子如下:

复制代码 代码如下:

//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。
foreach($rss->item as $v){
    echo $v->name,'
';//aaa
bbb

}
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
$rss->item[1]->name='ccc';//修改数据
foreach($rss->item as $v){
    echo $v->name,'
';//aaa
ccc

}
//可以用php内容函数unset来将一个元素从树中删除
unset($rss->item[1]);
foreach($rss->item as $v){
    echo $v->name,'
';//a www.jb51.net aa

}
//xml添加元素数据,可通过对象的addChild方法来实现
$item=$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,'
';//aaa
ccc_new

}
//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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