PHP SimpleXMLElement:XML文件解析和读写

$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

classXmlTest
{private$filename = "a.xml";
    private$isreading=false;
    private$rxml;

//创建XML文件publicfunctionwriteTest()
{$_data = <<

    A
    B
    C
    
            老四
            30
     
    Reminder
    Don't forget the meeting!

data;$xml = new SimpleXMLElement($_data);
        $xml->asXML($this->filename);
    }
    //读取文件privatefunctionreadFile()
    {if(!$this->isreading)
        {
            $this->rxml= simplexml_load_file($this->filename);
            $this->isreading=true;
        }
    }
    //测试:遍历某一数组publicfunctionreaddata()
    {$this->readFile();
        foreach ($this->rxml->data as$x) {
            echo"[".$x."]";

        }
        echo"
";
    }
    //测试 用数组下标读取数组某一项publicfunctionreaddata1()
    {$this->readFile();
        echo"读取第[1]个data数据:";
        echo$this->rxml->data[1] ."
";
    }
    //测试:读取2级XML节点publicfunctionreadfrom()
    {$this->readFile();
        echo"读取from节点:";
        echo$this->rxml->from->name .',';
        echo$this->rxml->from->arg."
";
                //读取name节点的fristname属性echo$this->rxml->from->name['fristname']."
";
    }
}


$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

publicfunctionreaddata_xpath() {$this->readFile();
        $data= $this->rxml->xpath('/root/data');
        foreach ($dataas$x) {
            echo"[".$x."]";

        }
        echo"
";
    }
    publicfunctionreaddata1_xpath()
    {$this->readFile();
        $data1 =  $this->rxml->xpath('/root/data');
        echo"读取第[1]个data数据:";
        echo$data1[1] ."
";
    }
    publicfunctionreadfrom_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$arg[0]."
";
        //读取name节点的fristname属性echo$name[0]['fristname']."
";
    }

$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