PHP几种操作XML的方式（一）

<?php
	//使用输出的方式生成xml格式的文档
	function printXml() {
		
		header("Content-Type:text/xml");
		
		print '<?xml version="1.0" encoding="utf-8"?>'."\n";
		print '<shows>';
		
		$arr = array(
			array(
				"name"=>"Simpsons",
				"channnel"=>"FOX",
				"start"=>"8:00",
				"duration"=>"30"
			),
			array(
				"name"=>"Law $amp; Order",
				"chnannel"=>"NBC",
				"start"=>"8:00 PM",
				"duration"=>"60"
			)
		);
		
		foreach($arr as $elem){
			
			print '<show>';
			
			foreach($elem as $key=>$value){
				
				print '<'.$key.'>'.$value.'</'.$key.'>';
			}
			
			print '</show>';
		}
		
		print '</shows>';
	}
	
	//使用DOMDocument
	function useDomDocument() {
		
		$dom = new DOMDocument("1.0");
		
		$book = $dom->appendChild($dom->createElement('book'));
		
		$title = $book->appendChild($dom->createElement('title'));
		$title->appendChild($dom->createTextNode('PHP Cookbook'));
		$title->setAttribute('cover','soft');
		
		$author = $book->appendChild($dom->createElement('author'));
		$author->appendChild($dom->createTextNode('Sklar'));
		
		$author = $book->appendChild($dom->createElement('author'));
		$author->appendChild($dom->createTextNode('Trachtenberg'));
		
		//调整格式
		$dom->formatOutput = True;
		
		header("Content-Type:text/xml");
		echo $dom->saveXML();
	}
	
	//用simplexml解析
	function parseXml() {
		
		$xml = simplexml_load_file("d:/test.xml");
		
		foreach($xml as $person){
			
			echo $person->firstname.",".$person->lastname."<br/>";
		}
	}
	
	//使用dom读取xml
	function parseXmlByDom() {
		
		$dom = new DOMDocument("1.0");
		$dom->load("d:/test.xml");
		
		foreach($dom->getElementsByTagName("person") as $person){
			
			$firstName = $person->getElementsByTagName("firstname")->item(0)->firstChild->nodeValue;
			
			echo $firstName."<br/>";
		}
	}
	
	//printXml();
	//useDomDocument();
	//parseXml();
	parseXmlByDom();
?>