diff --git wp-includes/functions.php wp-includes/functions-45643.php
index 659d657..4e220dc 100755
--- wp-includes/functions.php
+++ wp-includes/functions-45643.php
@@ -772,9 +772,6 @@ function _http_build_query( $data, $prefix = null, $sep = null, $key = '', $urle
  *
  * @since 1.5.0
  *
- * @param string|array $key   Either a query variable key, or an associative array of query variables.
- * @param string       $value Optional. Either a query variable value, or a URL to act upon.
- * @param string       $url   Optional. A URL to act upon.
  * @return string New URL query string (unescaped).
  */
 function add_query_arg() {
@@ -3076,6 +3073,7 @@ function wp_json_encode( $data, $options = 0, $depth = 512 ) {
  * @param mixed $data  Variable (usually an array or object) to encode as JSON.
  * @param int   $depth Maximum depth to walk through $data. Must be greater than 0.
  * @return mixed The sanitized data that shall be encoded to JSON.
+ * @throws Exception
  */
 function _wp_json_sanity_check( $data, $depth ) {
 	if ( $depth < 0 ) {
@@ -3538,7 +3536,7 @@ function smilies_init() {
  * @since 2.3.0 `$args` can now also be an object.
  *
  * @param string|array|object $args     Value to merge with $defaults.
- * @param array               $defaults Optional. Array that serves as the defaults. Default empty.
+ * @param string|array                  $defaults Optional. Array that serves as the defaults. Default empty.
  * @return array Merged user defined values with defaults.
  */
 function wp_parse_args( $args, $defaults = '' ) {
@@ -5433,7 +5431,7 @@ function wp_auth_check( $response ) {
  */
 function get_tag_regex( $tag ) {
 	if ( empty( $tag ) )
-		return;
+		return '';
 	return sprintf( '<%1$s[^<]*(?:>[\s\S]*<\/%1$s>|\s*\/>)', tag_escape( $tag ) );
 }