Create a shortcode in WordPress, again

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There’re lots of examples both here and on the internet, I’ve tried but don’t seem to be able to achieve what I need although it does feel like it should be simple enough.

Basically, I want to be able to use a shortcode like this:

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[download]http://site.com/file.doc[/download]

and I need WordPress to output this: 

<a class="download" href="http://site.com/file.doc">download file</a>
<a class="download" href="http://docs.google.com/viewer?embedded=true&url=http://site.com/file.doc">preview file</a>

Your help would be greatly appreciated. Thanks so much!

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  1. // Declare your shortcode
add_shortcode("download", "downloadFunction");

// Second Declare your shortcode function
function downloadFunction($att, $content, $code){

    // your function is passed 3 Arguments
    // $atts : this is an array of the shortcode's attributes
    // $content : this is the content between the code. in your case the file url.
    // $code : this is the code used. in this case it will be download.
    // here we only need the $content of the shortcode which we place for the file

$return = '<a class="download" href="'.$content.'">download file</a>';
$return .= '<a class="download" href="http://docs.google.com/viewer?embedded=true&url='.$content.'">preview file</a>';

// we then return the result.
return $return;
}