请教一个XML问题

Question

这是一个IP安全策略的 XML ,意思是每个用户只能在 ip为 <iplist> 里面内容时才能登陆, 我想知道怎么修改 和删除某个用户的 ip列表, 我用的是 DOMDOCUMENT();<?xml version="1.0" encoding="utf-8"?>
<user>
<username name="admin">
<iplist>192.168.1.1</iplist>
<iplist>192.168.1.2</iplist> //举个例子 假设,我想修改或删除admin  ip2的,其他的保持不变
<iplist>192.168.1.3</iplist> //因为节点名都相同, 我这里是不是要给 <iplist> 加id
<iplist>192.168.1.4</iplist>
<iplist>192.168.1.5</iplist>
</username>
<username name="user">
<iplist>192.168.1.11</iplist>
<iplist>192.168.1.12</iplist>
<iplist>192.168.1.13</iplist>
<iplist>192.168.1.14</iplist>
<iplist>192.168.1.15</iplist>
</username>
<username name="user2">
<iplist>192.168.1.21</iplist>
<iplist>192.168.1.22</iplist>
<iplist>192.168.1.23</iplist>
<iplist>192.168.1.24</iplist>
<iplist>192.168.1.25</iplist>
</username>
</user>

Answer 1

悲剧啊悲剧啊。 domDocument是非常标准的DOM模型，php manual详细的方法和例子，为什么偷懒？

Answer 2

<?php
$xml = <<<EOF
<?xml version="1.0" encoding="utf-8"?>
<user>
<username name="admin">
<iplist>192.168.1.1</iplist>
<iplist>192.168.1.2</iplist> 
<iplist>192.168.1.3</iplist> 
<iplist>192.168.1.4</iplist>
<iplist>192.168.1.5</iplist>
</username>
<username name="user">
<iplist>192.168.1.11</iplist>
<iplist>192.168.1.12</iplist>
<iplist>192.168.1.13</iplist>
<iplist>192.168.1.14</iplist>
<iplist>192.168.1.15</iplist>
</username>
<username name="user2">
<iplist>192.168.1.21</iplist>
<iplist>192.168.1.22</iplist>
<iplist>192.168.1.23</iplist>
<iplist>192.168.1.24</iplist>
<iplist>192.168.1.25</iplist>
</username>
</user>
EOF;$dom = new DOMDocument();
$ret = $dom->loadXML($xml, LIBXML_NOBLANKS);
$xpath = new DOMXpath($dom);
$node_list = $xpath->query('/user/username[@name="admin"]/iplist');
for ($i = 0; $i != $node_list->length; ++ $i) {
        echo $node_list->item($i)->nodeValue . PHP_EOL;
}
?>

Answer 3

$s =<<< XML
<?xml version="1.0" encoding="utf-8"?>
<user>
<username name="admin">
<iplist>192.168.1.1</iplist>
<iplist>192.168.1.2</iplist>
<iplist>192.168.1.3</iplist>
<iplist>192.168.1.4</iplist>
<iplist>192.168.1.5</iplist>
</username>
<username name="user">
<iplist>192.168.1.11</iplist>
<iplist>192.168.1.12</iplist>
<iplist>192.168.1.13</iplist>
<iplist>192.168.1.14</iplist>
<iplist>192.168.1.15</iplist>
</username>
<username name="user2">
<iplist>192.168.1.21</iplist>
<iplist>192.168.1.22</iplist>
<iplist>192.168.1.23</iplist>
<iplist>192.168.1.24</iplist>
<iplist>192.168.1.25</iplist>
</username>
</user>
XML;$dom = new domDocument;
$dom->loadXML($s);
$xpath = new DOMXPath($dom);//使用xpath定位修改
$p = $xpath->query("//username[@name='admin']/iplist[.='192.168.1.1']")->item(0);
$p->nodeValue = 'abcd';//使用xpath定位删除
$p = $xpath->query("//username[@name='admin']/iplist[.='192.168.1.2']")->item(0);
$p->parentNode->removeChild($p);echo $dom->saveXML();  <?xml version="1.0" encoding="utf-8" ?> 
<user>
 <username name="admin">
  <iplist>abcd</iplist> 
  <iplist>192.168.1.3</iplist> 
  <iplist>192.168.1.4</iplist> 
  <iplist>192.168.1.5</iplist> 
 </username>
 <username name="user">
  <iplist>192.168.1.11</iplist> 
  <iplist>192.168.1.12</iplist> 
  <iplist>192.168.1.13</iplist> 
  <iplist>192.168.1.14</iplist> 
  <iplist>192.168.1.15</iplist> 
 </username>
 <username name="user2">
  <iplist>192.168.1.21</iplist> 
  <iplist>192.168.1.22</iplist> 
  <iplist>192.168.1.23</iplist> 
  <iplist>192.168.1.24</iplist> 
  <iplist>192.168.1.25</iplist> 
 </username>
</user>

Answer 4

$doc = new DOMDocument; 
$doc->load('aa.xml');
$users = $doc->documentElement->getElementsByTagName('username');
$user=$users->item(0);
$ips = $user->getElementsByTagName('iplist');//修改ip的值
$ip2 = $ips->item(1);
$ip2->nodeValue=222222;  //移除ip3
$user->removeChild($ips->item(2));//保存xml
$doc->save("aa.xml"); 

Answer 5

非常感谢 ,请问 如果我想把某节点里面的内容全部删除 然后重写
<username name="admin">
  <iplist>192.168.1.1</iplist> 
  <iplist>192.168.1.2</iplist> 
  <iplist>192.168.1.3</iplist> 
  <iplist>192.168.1.4</iplist> 
 </username>$arr = array('999.999.999.1', '999.999.999.2', '999.999.999.3', '999.999.999.4');
foreach($arr as $v){
$newNode = $dom->createElement("iplist",$v);
   $dom->appendChild($newNode);
}
这样行么

Answer 6

还要问个问题
现在
$s =<<< XML
 ......XML;
可以用但是 
define('XML', d:/a.xml);
$dom->load(XML);这样就报错Warning: DOMDocument::loadXML(): Start tag expected, '<' not found in Entity, line: 1 in /usr/ikuai/www/include/common.php on line 30 Fatal error: Call to a member function removeChild() on a non-object in /usr/ikuai/www/include/common.php on line 39