如何在使用`simple_load_file（）`加载xml文件后访问元素

Question

我打算从xml文件中提取某些数据。我用simple_load_file()加载一个XML文件并获取对象元素，但我不知道如何访问它们。 XML文件就像下面：

<?mxl version="1.0"> 
<metaData> 
<Application version="1.0" type="32"> 
    <options> 
     <section name="A"> 
      <description>...</description> 
      ... 
     <section name="B"> 
     .... 
    </options> 
</Application> 
</metaData> 

我的代码：

$xml = simplexml_load_file($url); 
echo $xml->Application->version; // get the version but failed 
echo $xml->Application->options->section...//I want to get the data from each section, but I don't know how to visit the elements. 

Answer 1

在我回答这个问题，让我告诉你一个小技巧，只要你有任何问题，请尝试搜索它在谷歌，像在这种情况下，我会搜索：

PHP simplexml examples 

好吧，让我们说我们有一个XML内容：

<?php 
$xmlstr = <<<XML 
<?xml version='1.0' standalone='yes'?> 
<movies> 
<movie> 
    <title>PHP: Behind the Parser</title> 
    <characters> 
    <character> 
    <name>Ms. Coder</name> 
    <actor>Onlivia Actora</actor> 
    </character> 
    <character> 
    <name>Mr. Coder</name> 
    <actor>El Act&#211;r</actor> 
    </character> 
    </characters> 
    <plot> 
    So, this language. It's like, a programming language. Or is it a 
    scripting language? All is revealed in this thrilling horror spoof 
    of a documentary. 
    </plot> 
    <great-lines> 
    <line>PHP solves all my web problems</line> 
    </great-lines> 
    <rating type="thumbs">7</rating> 
    <rating type="stars">5</rating> 
</movie> 
</movies> 
XML; 
?> 

我们可以解析XML数据是这样的：

<?php 


$movies = new SimpleXMLElement($xmlstr); 

echo $movies->movie[0]->plot; 
?> 

更多例子，请访问： http://php.net/manual/en/simplexml.examples-basic.php

对于具体的这个问题，你应该使用SimpleXMLElement::children

Answer 2

试试这个

// attribute accessing 
$version = (string)$xml->Application['version'] 
// or 
$version = (string)$xml->Application->attributes()->version; 


// acess children 
foreach($xml->Application->section as $section) 
{ 
    // you can work with single section here 
} 

// or other way 
foreach($xml->Application->children() as $section) 
{ 
    // you can work with single section here 
}