Having trouble getting values from an xml file - php

Question

When I try to get values it doesn't seem to work. The xml file contains multiples of the same node <post> and I thought you could call a specific node like an array, but that doesn't seem to work. Below I have included the code.
File that gets xml values:
<?php
if(file_exists('settings.xml')){
$settings = simplexml_load_file('settings.xml');
$site_title = $settings->title;
$site_name = $settings->title;
$site_stylesheet = "css/main.css";
$theme_folder = "themes/".$settings->theme;
if(file_exists('posts.xml')){
$posts = simplexml_load_file('posts.xml');
$post = $posts->post[$_GET['post']];
$post_title = $post->title;
$post_content = $post->content;
$post_author = $post->author;
include($theme_folder."/header.php");
include($theme_folder."/post.php");
include($theme_folder."/footer.php");
} else {
exit("File \"posts.xml\" does not exist!");
}
} else {
exit("File \"settings.xml\" does not exist!");
}
?>
File that is included in the file above and uses the variables that the xml passes to:
<article>
<h1><?php echo $post_title ?></h1>
<?php echo $post_content ?>
<p><?php echo $post_author ?></p>
</article>
Xml file:
<?xml version="1.0" encoding="utf-8"?>
<posts>
<post>
<title>Hello World</title>
<author>tacticalsk8er</author>
<content>Hello world this is my blogging site</content>
</post>
<post>
<title>Hello Again</title>
<author>Nick Peterson</author>
<content><![CDATA[Hello Again world this is another test for my <b>blogging site</b>]]></content>
</post>
</posts>

Answer 1

Of course, you can access nodes in simplexml 'array-style':
$post = $xml->post[1]; // select second node
echo $post->title;
$xml represents the root-node <posts>, $xml->post selects posts/post.
see it working: http://3v4l.org/KOiv2
see the manual: http://www.php.net/manual/en/simplexml.examples-basic.php