php中DOMDocument简单用法(XML创建、添加、删除、修改)

PHP写XML方法很多,这里主要介绍一下DOMDocument的用法,跟 JS大体上相同,其实非常简单。

共分四个文件,分别是创建、增加、删除、修改四个功能,变量都是写死的,改一改用$_POST方式接收就可以用了

//index.php 创建功能

<?php
$xmlpatch = 'index.xml';
$_id = '1';
$_title = 'title1';
$_content = 'content1';
$_author = 'author1';
$_sendtime = 'time1';
$_htmlpatch = '1.html';

$doc = new DOMDocument('1.0', 'utf-8');
$doc -> formatOutput = true;

$root = $doc -> createElement('root');//新建节点

$index = $doc -> createElement('index');//新建节点

$url = $doc -> createAttribute('url');//新建属性
$patch = $doc -> createTextNode($_htmlpatch);//新建TEXT值
$url -> appendChild($patch);//将$patch文本设为$url属性的值

$id = $doc -> createAttribute('id');
$newsid = $doc -> createTextNode($_id);
$id -> appendChild($newsid);

$title = $doc -> createAttribute('title');
$newstitle = $doc -> createTextNode($_title);
$title -> appendChild($newstitle);

$content = $doc -> createTextNode($_content);//节点值

$author = $doc -> createAttribute('author');
$newsauthor = $doc -> createTextNode($_author);
$author -> appendChild($newsauthor);

$sendtime = $doc -> createAttribute('time');
$newssendtime = $doc -> createTextNode($_sendtime);
$sendtime -> appendChild($newssendtime);

$index -> appendChild($id);//将$id设为index节点的属性,以下类同
$index -> appendChild($title);
$index -> appendChild($content);
$index -> appendChild($url);
$index -> appendChild($author);
$index -> appendChild($sendtime);

$root -> appendChild($index);//设置index为root字节点

$doc -> appendChild($root);//设置root为跟节点

$doc -> save($xmlpatch);//保存文件

echo $xmlpatch . ' has create success';

?>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>XML操作</title>
</head>

<body>
</body>
</html>

//add.php 增加功能(跟index.php文件差不多,主要就是加个load载入跟 $root = $doc -> documentElement获得跟节点

<?php
$xmlpatch = 'index.xml';
$_id = '2';
$_title = 'title2';
$_content = 'content2';
$_author = 'author2';
$_sendtime = 'time2';
$_htmlpatch = '2.html';

$doc = new DOMDocument();
$doc -> formatOutput = true;
if($doc -> load($xmlpatch)) {
$root = $doc -> documentElement;//获得根节点(root)
$index = $doc -> createElement('index');

$url = $doc -> createAttribute('url');
$patch = $doc -> createTextNode($_htmlpatch);
$url -> appendChild($patch);

$id = $doc -> createAttribute('id');
$newsid = $doc -> createTextNode($_id);
$id -> appendChild($newsid);

$title = $doc -> createAttribute('title');
$newstitle = $doc -> createTextNode($_title);
$title -> appendChild($newstitle);

$content = $doc -> createTextNode($_content);

$author = $doc -> createAttribute('author');
$newsauthor = $doc -> createTextNode($_author);
$author -> appendChild($newsauthor);

$sendtime = $doc -> createAttribute('time');
$newssendtime = $doc -> createTextNode($_sendtime);
$sendtime -> appendChild($newssendtime);

$index -> appendChild($id);
$index -> appendChild($title);
$index -> appendChild($content);
$index -> appendChild($url);
$index -> appendChild($author);
$index -> appendChild($sendtime);

$root -> appendChild($index);

$doc -> save($xmlpatch);

echo $_id . ' has been added in ' . $xmlpatch;

} else {
echo 'xml file loaded error!';
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>XML操作-添加</title>
</head>

<body>
</body>
</html>

//edit.php 修改功能(这里只修改title属性值 跟节点值)

<?php
$xmlpatch = 'index.xml';
$_id = '2';
$_title = 'has been changed';
$_content = 'has been changed';

$doc = new DOMDocument();
$doc -> formatOutput = true;

if($doc -> load($xmlpatch)) {
$root = $doc -> documentElement;
$elm = $root -> getElementsByTagName('index');
$checkexist = 0;
foreach ($elm as $new) {
   if($new -> getAttribute('id') == $_id) {
    $new -> setAttribute('title', $_title);
    $new -> nodeValue = $_content;//修改节点值,真是太意外了,没想到跟JS一样直接能赋值...
    //$new -> removeChild($new -> nodevalue);
    $checkexist = 1;
   }
}
if($checkexist == 0) {
   echo $_id . ' is not found in ' . $xmlpatch;
} else {
   $doc -> save($xmlpatch);
   echo $_id . ' has been changed';
}
} else {
echo 'xml file loaded error!';
}

?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>XML操作-修改</title>
</head>

<body>
</body>
</html>

//del.php 删除功能

<?php
$xmlpatch = 'index.xml';
$_id = '2';

$doc = new DOMDocument();
$doc -> formatOutput = true;
if($doc -> load($xmlpatch)) {
$root = $doc -> documentElement;
$elm = $root -> getElementsByTagName('index');
foreach ($elm as $new) {
   if($new -> getAttribute('id') == $_id) {
    if($root -> removeChild($new)) {
     echo $_id . ' has been deleted';
    } else {
     echo $_id . ' delete failed';
    }
   }
}
$doc -> save($xmlpatch);
} else {
echo 'xml file loaded error!';
}

?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>XML操作-删除</title>
</head>

<body>
</body>
</html>

 

总结一下,创建跟添加主要用的就是create跟appendChild,create后边跟Element就是创建节点,跟Attribute就是创建属性,TextNode就是创建值,然后appendChild就是设置从属关系,这么一看非常简单。

删除与修改都是用先获得节点列表getElementsByTagName然后foreach遍历想要修改的节点

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