PHP control XML

php對xml文件中節點的删除\修改
使用getElementsByTagName()方法删除\修改XML節點
三個文件：
1.root.=xml
2.remove.php —— 删除節點
3.replace.php —— 修改節點
root.xml

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root.xml

<root> 
<child1>child1 content</child1> 
<child2>child2 content</child2> 
<child3>child3 content</child3> 
</root> 

remove.php

<?php 
$xml_str = file_get_contents("root.xml"); //root.xml為檔名

$doc = DOMDocument::loadXML($xml_str); //載入此字串 

//取得元素$child2 
$root = $doc->documentElement; 
$child2 = $root->;getElementsByTagName("child2")->;item(0); 

//刪除$child2 
$root->removeChild($child2); 

//存檔 
$doc->formatOutput = true; 
$doc->saveXML(); 
$doc->save("root.xml"); 
?> 

replace.php

<?php 
$xml_str = file_get_contents("root.xml"); //將root.xml為檔名 

$doc = DOMDocument::loadXML($xml_str); //載入字串 

//取得元素$child3 
$root = $doc->documentElement; 
$child3 = $root->getElementsByTagName("child3")->item(0); 

//建立一個newchild元素來替代child3 
$root->replaceChild(new DOMElement("newchild", "new content"), $child3); 

//存檔 
$doc->formatOutput = true; 
$doc->saveXML(); 
$doc->save("root.xml"); 
?>

使用使用XPath刪除\修改節點

1.xml.xml


2.re.php —— 取代\刪除節點


3.replace.xml —— 修改節點後的XML


4.remove.xml —— 刪除節點後的XML





xml.xml 

<?xml version="1.0"?> 
<books> 
<book> 
<author>Jack Herrington</author> 
<title>PHP Hacks</title> 
<publisher>O'Reilly</publisher> 
</book> 

<book> 
<author>Jack Herrington</author> 
<title>Podcasting Hacks</title> 
<publisher>O'Reilly</publisher> 
</book> 
</books> 

re.php

<?php 
$dom = new DomDocument(); 
$dom -> load("xml.xml"); 
$xpath = new domxpath($dom); 

//修改節點 
$oldtitle = $xpath->query("/books/book/title")->item(0); 
$newtitle = $dom->createElement("title"); 
$newtitle->appendChild(new DOMText("NEW")); 
$oldtitle->parentNode->replaceChild($newtitle, $oldtitle); 
$dom->save("replace.xml"); 

//刪除節點 
$oldtitle = $xpath->query("/books/book/title")->item(1); 
$oldtitle->parentNode->removeChild($oldtitle); 
$dom->save("remove.xml"); 
?>

replace.xml

<?xml version="1.0"?> 
<books> 
<book> 
<author>Jack Herrington</author> 
<title>NEW</title> 
<publisher>O'Reilly</publisher> 
</book> 

<book> 
<author>Jack Herrington</author> 
<title>Podcasting Hacks</title> 
<publisher>O'Reilly</publisher> 
</book> 
</books> 

remove.xml

<?xml version="1.0"?> 
<books> 
<book> 
<author>Jack Herrington</author> 
<title>NEW</title> 
<publisher>O'Reilly</publisher> 
</book> 

<book> 
<author>Jack Herrington</author> 

<publisher>O'Reilly</publisher> 
</book> 
</books>