php用simplexml来操作xml

<?php

$username = 'zhansan';

if (!file_exists('001.xml'))
{
   $fp = fopen('001.xml', 'w');
   $xmlContent = '<?xml version="1.0" encoding="utf-8"?><record></record>';
   fwrite($fp, $xmlContent);
   fclose($fp);

   $xml = simplexml_load_file('001.xml');
   $unode = $xml->addChild($username);
   $unode->addChild('times', 2);
   $unode->addChild('time', '2016');
   $unode->addChild('ip', '192.1.0.11');

   $unode = $xml->addChild('lisi');
   $unode->addChild('times', 22);
   $unode->addChild('time', '2016');
   $unode->addChild('ip', '12.0.0.13');

   $xml->asXML('001.xml');
}
//修改
$xml = simplexml_load_file('001.xml');
echo $xml;
$usr = $xml->lisi;
$usr->times += 1;
echo $usr->times;
$xml->asXML('001.xml');

/**
 * 删除
*/
//unset($xml->zhansan);
//$xml->asXML('001.xml');

//查看

//删除xml文件
//unlink('001.xml');

echo '<br />';
/**
 * 查看xml,不一定好
 */
//$dom   = simplexml_import_dom($xml);
echo $dom->zhansan->times.'<br />';

if ($dom->saonv->times === null)
{
   echo 'saop is not exist';
}
echo '<br />';
var_dump($xml->lisis->times);

/**
* 将xml转为数组 ,注意，如果有顶级同名节点会被合并
*/

$jn = json_encode($xml);
$data = json_decode($jn, true);

echo '<pre>';
print_r($data['xml']['node']);
echo '</pre>';

?>