WPquestions.com #2235 rev1

gistfile1.php

<?php // answer to wpquestions.com #2235 by Julian Lannigan (julianlannigan.com)
function coauthor_add_to_wardrobe_link() {
	$currentUrl = "http".(($_SERVER["HTTPS"] == "on") ? "s" : "")."://".$_SERVER["SERVER_NAME"].(($_SERVER["SERVER_PORT"] != "80") ? ":".$_SERVER["SERVER_PORT"] : "").$_SERVER["REQUEST_URI"]; //Gets current page url
	if (defined('COAUTHORS_PLUS_VERSION')) {
		global $current_user;
		if (is_user_logged_in()) {
			//Check if they have requested to be an author
			if (isset($_REQUEST['addToWardrobe']) && is_numeric($_REQUEST['addToWardrobe']) && $_REQUEST['addToWardrobe'] > 0) {
				if (!is_coauthor_for_post($current_user->user_login, $_REQUEST['addToWardrobe'])) {
					$cAuthors = array();
					foreach (get_coauthors($_REQUEST['addToWardrobe']) as $theAuthor) {
						$cAuthors[] = $theAuthor->user_login;
					}
					$cAuthors[] = $current_user->user_login;
					$cObj = new coauthors_plus();
					$cObj->add_coauthors($_REQUEST['addToWardrobe'], $cAuthors);
					$statusMsg = "This has been added to your wardrobe!";
				}
			}
			
			//Display link
			if (isset($statusMsg) && $statusMsg != "" && isset($_REQUEST['addToWardrobe']) && $_REQUEST['addToWardrobe'] == $post->ID) {
				//They just added it to the wardrobe
				echo $statusMsg;
			} elseif (is_coauthor_for_post($current_user->user_login, $post->ID)) {
				//They are already a coauthor.
				echo "This is already in your wardrobe.";
			} else {
				//They are not a coauthor yet.
				$currentUrl = preg_replace('/([?&])addToWardrobe=[^&]+(&|$)/','$1',$url); //remove the get var in the url
				echo "<a href=\"".$currentUrl."?addToWardrobe={$post->ID}\">Add this to your wardrobe.</a>";
			}
			
		} else {
			//This is totally optional, but you could output
			// something here that says "Login to add to your wardrobe"
			echo "<a href=\"".wp_login_url($currentUrl)."\">Login to add to your wardrobe</a>";
		}
	}
}
?>