Is this possible to extract all the text only from a HTML file?

I am taking about remove all format, all the text just like you go to any page of the website, user Ctrl+A, and Ctrl + C, then use Ctrl + V to paste all the content in a notepad. And you will understand what I mean by extracting all the text....only. Let use a site for a better explain: This site: https://developer.palm.com/content/resources/develop/quick_start_ios.html

And the thing I want:

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Quick Start - iOS Developers
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If you've been developing for iOS® and are looking to expand your audience, we're here to help. Getting started with webOS is easy! If your current focus is OpenGL/SDL, then the transition will be simplicity itself. We have lots of great stories of developers porting their OpenGL apps very quickly. You can use the publicly available 3.0 SDK to do OpenGL/SDL development now with the included Plug-in Development Kit (PDK). Best of all, the PDK integrates nicely with  Xcode.

If your focus is web app development, you'll want to look at Enyo, our next-generation JavaScript framework, which is included in the 3.0 SDK.

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This should work

<?php 

echo strip_tags(file_get_contents("https://developer.palm.com/content/resources/develop/quick_start_ios.html"));

Thats the general idea. You can do things like str_replace('<br/>', '\n', $output) to format it better.

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I use lynx, try this from your terminal:

lynx -dump http://www.google.com

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Another way to do it is to retrieve the value of the page's body tag:

$html = new DOMDocument();

$html->loadHTMLFile("https://developer.palm.com/content/resources/develop/quick_start_ios.html");

$body = $html->getElementsByTagName("body");
$body = $body->item(0);

echo $body->nodeValue;

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you can use the document tree to do this, just leave all the text nodes and remove all the element nodes.

you can implement this with javascript or C++ with webkit.