Deconstruction: Brilliantly.net (Part One) - URL Variable Shortcode

url.php

//Years Since Shortcode
//usage [years-since date='2010-01-01']
function bww_years_since($atts, $content = null) {
    extract(shortcode_atts(array("date" => ''), $atts));
    if(empty($date)) {
      return "<br /><br />************No date provided************<br /><br />";
    }
    $mdr_unix_date = strtotime($date);
    $mdr_time_difference = time() - $mdr_unix_date ;
    $years = floor($mdr_time_difference / 31556926 );
    $num_years_since = $years;
    return $num_years_since .' years';
  }

add_shortcode('years-since', 'bww_years_since');


// URL Parameter Shortcode Size
// PressNest Plan Match Page

function bww_url_param_shortcode_size() {
    return $_GET['size'];
}
add_shortcode( 'url-size', 'bww_url_param_shortcode_size' );


// URL Parameter Shortcode Sell
// PressNest Plan Match Page

function bww_url_param_shortcode_sell() {
    return $_GET['sell'];
}
add_shortcode( 'url-sell', 'bww_url_param_shortcode_sell' );


// URL Parameter Shortcode Changes
// PressNest Plan Match Page

function bww_url_param_shortcode_changes() {
    return $_GET['changes'];
}
add_shortcode( 'url-changes', 'bww_url_param_shortcode_changes' );


// URL Parameter Shortcode Help
// PressNest Plan Match Page

function bww_url_param_shortcode_help() {
    return $_GET['help'];
}
add_shortcode( 'url-help', 'bww_url_param_shortcode_help' );


// URL Parameter Shortcode First Name
// PressNest Plan Match Page & Schedule Discover Call Page

function bww_url_param_shortcode_firstname() {
    return $_GET['firstname'];
}
add_shortcode( 'url-firstname', 'bww_url_param_shortcode_firstname' );


// URL Parameter Shortcode Email
// Schedule Discover Call Page

function bww_url_param_shortcode_email() {
    return $_GET['email'];
}
add_shortcode( 'url-email', 'bww_url_param_shortcode_email' );