PHP SimpleXMLElement:XML文件解析和读写

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PHP保存XML文件

$xml = new SimpleXMLElement(XML数据);        $xml->asXML(文件名);

PHP读取XML文件

XXX= simplexml_load_file(文件名);

1.使用面向对象方式访问XML

<?phpclass XmlTest{    private $filename = "a.xml";    private $isreading=false;    private  $rxml;//创建XML文件public function writeTest(){        $_data = <<<data<?xml version="1.0" encoding="UTF-8"?><root>    <data>A</data>    <data>B</data>    <data>C</data>    <from>            <name fristname='陈'>老四</name>            <arg>30</arg>     </from>    <heading>Reminder</heading>    <body>Don't forget the meeting!</body></root>data;        $xml = new SimpleXMLElement($_data);        $xml->asXML($this->filename);    }    //读取文件    private  function  readFile()    {        if(!$this->isreading)        {            $this->rxml= simplexml_load_file($this->filename);            $this->isreading=true;        }    }    //测试:遍历某一数组    public  function  readdata()    {       $this->readFile();        foreach ($this->rxml->data as $x) {            echo "[".$x."]";        }        echo "<br>";    }    //测试 用数组下标读取数组某一项    public  function  readdata1()    {         $this->readFile();        echo "读取第[1]个data数据:";        echo $this->rxml->data[1] ."<br>";    }    //测试:读取2级XML节点    public  function  readfrom()    {         $this->readFile();        echo "读取from节点:";        echo $this->rxml->from->name .',';        echo $this->rxml->from->arg."<br>";                //读取name节点的fristname属性        echo $this->rxml->from->name['fristname']."<br>";    }}$tmp = new XmlTest();$tmp->writeTest();$tmp->readdata();$tmp->readdata1();$tmp->readfrom();?>

浏览器打印:

[A][B][C]读取第[1]个data数据:B读取from数据:老四,30陈

2.使用xpath访问XML., 用路径获取节点，区别:获取的节点都以数组返回,因此用数组下标访问

 public  function readdata_xpath() {        $this->readFile();        $data= $this->rxml->xpath('/root/data');        foreach ($data as $x) {            echo "[".$x."]";        }        echo "<br>";    }    public  function  readdata1_xpath()    {        $this->readFile();        $data1 =  $this->rxml->xpath('/root/data');        echo "读取第[1]个data数据:";        echo $data1[1] ."<br>";    }    public  function  readfrom_xpath()    {        $this->readFile();        $name= $this->rxml->xpath('/root/from/name');        $arg= $this->rxml->xpath('/root/from/arg');        echo "读取from数据:";         echo $name[0] .',';        echo $arg[0]."<br>";        //读取name节点的fristname属性          echo $name[0]['fristname']."<br>";    }

$tmp->readdata_xpath();$tmp->readdata1_xpath();$tmp->readfrom_xpath();******************浏览器打印:[A][B][C] 读取第[1]个data数据:B 读取from数据:老四,30 陈

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