In WordPress, get current URL including query string

wp_get_current_page_url.php

<?php
/** 
 Re-use some existing WordPress functions so you don't have to write a bunch of raw PHP to check for SSL, port numbers, etc
 
 Place in your functions.php (or re-use in a plugin)

 If you absolutely don't need or want any query string, use home_url(add_query_arg(array(),$wp->request));
 
 Hat tip to:
  + http://kovshenin.com/2012/current-url-in-wordpress/
  + http://stephenharris.info/how-to-get-the-current-url-in-wordpress/
*/

/**
* Build the entire current page URL (incl query strings) and output it
* Useful for social media plugins and other times you need the full page URL
* Also can be used outside The Loop, unlike the_permalink
* 
* @returns the URL in PHP (so echo it if it must be output in the template)
* Also see the_current_page_url() syntax that echoes it
*/
if ( ! function_exists( 'get_current_page_url' ) ) {
function get_current_page_url() {
  global $wp;
  return add_query_arg( $_SERVER['QUERY_STRING'], '', home_url( $wp->request ) );
}
}

/*
* Shorthand for echo get_current_page_url(); 
* @returns echo'd string
*/
if ( ! function_exists( 'the_current_page_url' ) ) {
function the_current_page_url() {
  echo get_current_page_url();
}
}

?>