使用PHP生成和获取XML格式数据

1.php生成xml

代码如下：

<?php
header("content-type:text/html;charset=utf-8");
$con = mysql_connect('localhost','root','root');
mysql_query('set names utf8');
$db = mysql_select_db('wh');

// var_dump($con,$db);
$sql = "select * from stu";
$res = mysql_query($sql)or die(mysql_error());

while($row=mysql_fetch_assoc($res)){
$arr[] = array(
   'name' => $row['name'],
   'age' => $row['age'],
   'email' => $row['email']

    );
}

$doc = new DOMDocument('1.0', 'utf-8');  // 声明版本和编码

// var_dump($doc);
$doc->formatOutput = true;

$r = $doc->createElement("root");
$doc->appendChild($r);

foreach ($arr as $dat) {
    $b = $doc->createElement("data");

    $name = $doc->createElement("name");
    $name->appendChild($doc->createTextNode($dat['name']));
    $b->appendChild($name);

    $sex = $doc->createElement("age");
    $sex->appendChild($doc->createTextNode($dat['age']));
    $b->appendChild($sex);

    $age = $doc->createElement("email");
    $age->appendChild($doc->createTextNode($dat['email']));
    $b->appendChild($age);

    $r->appendChild($b);
}

echo $doc->saveXML();

?>

 2.读取xml文件信息

a.准备xml文件: f.xml。如：

<?xml version="1.0" encoding="utf-8"?>
<root>
  <data>
    <name>wuheng</name>
    <age>23</age>
    <email>demo@qq.com</email>
  </data>
  <data>
    <name>wuheng009</name>
    <age>22</age>
    <email>dem6@qq.com</email>
  </data>
  <data>
    <name>wuheng555</name>
    <age>22</age>
    <email>dem6@qq.com</email>
  </data>
  <data>
    <name>xia</name>
    <age>11</age>
    <email>456@qq.com</email>
  </data>
  <data>
    <name>xia11</name>
    <age>12</age>
    <email>466@qq.com</email>
  </data>
</root>

b.具体的代码，如下：

<?php
header("content-type:text/html;charset=utf-8");
$url = "f.xml";
$reader = new XMLReader();  //实例化XMLReader
$reader->open($url); //获取xml
$i=1;
while ($reader->read()) {    
  if ($reader->nodeType == XMLReader::TEXT) { //判断node类型
     $m = $i%3;
     if($m==1)
         $name = $reader->value;  //读取node值
     if($m==2)
         $age = $reader->value;
     if($m==0){
         $email = $reader->value;
         $arr[] = array(
             'name' => $name,
             'age' => $age,
             'email' => $email
         );
     }
     $i++;
  }
}
print_r($arr);

?>