Update get_current_user_id() and move to user.php. Props filosofo. fixes #13785

git-svn-id: https://develop.svn.wordpress.org/trunk@15174 602fd350-edb4-49c9-b593-d223f7449a82

wp-includes/user.php

@@ -210,6 +210,20 @@ function user_pass_ok($user_login, $user_pass) {
 // User option functions
 //
 
+/**
+ * Get the current user's ID
+ * 
+ * @since MU
+ * 
+ * @uses wp_get_current_user
+ *
+ * @return int The current user's ID
+ */
+function get_current_user_id() {
+	$user = wp_get_current_user();
+	return ( isset( $user->ID ) ? (int) $user->ID : 0 );
+}
+
 /**
  * Retrieve user option that can be either per Site or per Network.
  *