php读取XML的常见方法实例总结

<?xml version="1.0 encoding="utf-8"?>
<humans>
   <zhangying>
     <name>张映</name>
     <sex>男</sex>
     <old>28</old>
   </zhangying>
   <tank>
     <name>tank</name>
     <sex>男</sex>
     <old>28</old>
   </tank>
</humans>

<?php
   $doc = new domdocument();
   $doc->load('person.xml'); //读取xml文件
   $humans = $doc->getelementsbytagname( "humans" ); //取得humans标签的对象数组
   foreach( $humans as $human )
   {
     $names = $human->getelementsbytagname( "name" ); //取得name的标签的对象数组
     $name = $names->item(0)->nodevalue; //取得node中的值，如<name> </name>
     $sexs = $human->getelementsbytagname( "sex" );
     $sex = $sexs->item(0)->nodevalue;
     $olds = $human->getelementsbytagname( "old" );
     $old = $olds->item(0)->nodevalue;
     echo "$name - $sex - $oldn";
   }
?>

<?php
   $xml_array=simplexml_load_file('person.xml'); //将xml中的数据,读取到数组对象中
   foreach($xml_array as $tmp){
     echo $tmp->name."-".$tmp->sex."-".$tmp->old."<br>";
   }
?>

<?php
   $xml = "";
   $f = fopen('person.xml', 'r');
   while( $data = fread( $f, 4096 ) ) {
     $xml .= $data;
   }
   fclose( $f );
   // 上面读取数据
   preg_match_all( "/<humans>(.*?)</humans>/s", $xml, $humans ); //匹配最外层标签里面的内容
   foreach( $humans[1] as $k=>$human )
   {
     preg_match_all( "/<name>(.*?)</name>/", $human, $name ); //匹配出名字
     preg_match_all( "/<sex>(.*?)</sex>/", $human, $sex ); //匹配出性别
     preg_match_all( "/<old>(.*?)</old>/", $human, $old ); //匹配出年龄
   }
   foreach($name[1] as $key=>$val){
     echo $val." - ".$sex[$key][1]." - ".$old[$key][1]."<br>" ;
   }
?>

<?php
   $reader = new xmlreader();
   $reader->open('person.xml'); //读取xml数据
   $i=1;
   while ($reader->read()) { //是否读取
     if ($reader->nodetype == xmlreader::text) { //判断node类型
       if($i%3) {
         echo $reader->value; //取得node的值
       } else {
         echo $reader->value."<br>" ;
       }
       $i++;
     }
   }
?>