Patch for the Users 2 CSV WordPress plugin. Change the first column heading to UID rather than duplicate URL title. Fixes some PHP warnings for variables.

users2csv.php.patch

Index: users2csv.php
===================================================================
--- users2csv.php  (revision 277117)
+++ users2csv.php  (working copy)
@@ -26,7 +26,7 @@
 
 if ( is_admin() ) {
 
-	if ($_GET['page'] == "users2csv.php") {
+	if ( isset( $_GET['page'] ) && $_GET['page'] == 'users2csv.php' ) {
 		function _valToCsvHelper($val, $separator, $trimFunction) {
 			if ($trimFunction) $val = $trimFunction($val);
 			//If there is a separator (;) or a quote (") or a linebreak in the string, we need to quote it.
@@ -146,7 +146,7 @@
 					break;
 				case 'users':
 				default:
-					$fields = array('URL','E-Mail','URL','Display Name','Registration Date','First Name','Last Name','Nickname');
+					$fields = array('UID','E-Mail','URL','Display Name','Registration Date','First Name','Last Name','Nickname');
 					break;
 			}
 			$csv = arrayToCsvString($fields, $sep);
@@ -209,7 +209,7 @@
 		add_action('admin_menu','yoast_getcsv');
 	}
 
-	if ( ! class_exists( 'Users2CSV' ) && !$_GET['csv'] == "true" ) {
+	if ( ! class_exists( 'Users2CSV' ) && ( ! isset( $_GET['csv'] ) || ! $_GET['csv'] == 'true' ) ) {
 
 		class Users2CSV {