SimpleXMLElement类对象的实例化

首先简单介绍一下SimpleXMLElement类

final public SimpleXMLElement::__construct() ( string $data [, int $options = 0 [, bool $data_is_url = false [, string $ns = "" [, bool $is_prefix = false ]]]] )

Creates a new SimpleXMLElement object

data

A well-formed XML string or the path or URL to an XML document ifdata_is_url is TRUE.

options

Optionally used to specify additional Libxml parameters.

data_is_url

By default, data_is_url is FALSE. Use TRUE to specify that data is a path or URL to an XML document instead ofstring data

1)第一种

<?
 $xml=new SimpleXMLElement("demo01.xml",null,true);

2)第二种【传参是字符串】

<?php
	$str = <<<xml
	<student>
		<name>zhangsan</name>
		<age>30</age>
	</student>
xml;

	$xml=new SimpleXMLElement($str);

3)第三种【通过simplexml_load_file方法可以返回SimpleXMLElement类的对象,完成实例化】 

<?
$xml=simplexml_load_file("demo01.xml");

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