HTML API: Fix phpdoc nullable types

src/wp-includes/class-wp-token-map.php

@@ -520,10 +520,11 @@ public function contains( $word, $case_sensitivity = 'case-sensitive' ) {
 	 *
 	 * @since 6.6.0
 	 *
-	 * @param string  $text                       String in which to search for a lookup key.
-	 * @param int     $offset                     Optional. How many bytes into the string where the lookup key ought to start. Default 0.
-	 * @param ?int    &$matched_token_byte_length Optional. Holds byte-length of found token matched, otherwise not set. Default null.
-	 * @param string  $case_sensitivity           Optional. Pass 'ascii-case-insensitive' to ignore ASCII case when matching. Default 'case-sensitive'.
+	 * @param string   $text                       String in which to search for a lookup key.
+	 * @param int      $offset                     Optional. How many bytes into the string where the lookup key ought to start. Default 0.
+	 * @param int|null &$matched_token_byte_length Optional. Holds byte-length of found token matched, otherwise not set. Default null.
+	 * @param string   $case_sensitivity           Optional. Pass 'ascii-case-insensitive' to ignore ASCII case when matching. Default 'case-sensitive'.
+	 *
 	 * @return string|null Mapped value of lookup key if found, otherwise `null`.
 	 */
 	public function read_token( $text, $offset = 0, &$matched_token_byte_length = null, $case_sensitivity = 'case-sensitive' ) {

src/wp-includes/functions.php

@@ -7497,7 +7497,7 @@ function get_tag_regex( $tag ) {
  *
  * @since 6.6.0
  *
- * @param ?string $blog_charset Slug representing a text character encoding, or "charset".
+ * @param string|null $blog_charset Slug representing a text character encoding, or "charset".
  *                              E.g. "UTF-8", "Windows-1252", "ISO-8859-1", "SJIS".
  * @return bool Whether the slug represents the UTF-8 encoding.
  */

src/wp-includes/html-api/class-wp-html-open-elements.php

@@ -499,7 +499,7 @@ public function walk_down() {
 	 * @since 6.4.0
 	 * @since 6.5.0 Accepts $above_this_node to start traversal above a given node, if it exists.
 	 *
-	 * @param ?WP_HTML_Token $above_this_node Start traversing above this node, if provided and if the node exists.
+	 * @param WP_HTML_Token|null $above_this_node Start traversing above this node, if provided and if the node exists.
 	 */
 	public function walk_up( $above_this_node = null ) {
 		$has_found_node = null === $above_this_node;

src/wp-includes/html-api/class-wp-html-processor.php

@@ -241,14 +241,14 @@ class WP_HTML_Processor extends WP_HTML_Tag_Processor {
 	 *
 	 * @since 6.6.0
 	 *
-	 * @var ?WP_HTML_Stack_Event
+	 * @var WP_HTML_Stack_Event|null
 	 */
 	private $current_element = null;
 
 	/**
 	 * Context node if created as a fragment parser.
 	 *
-	 * @var ?WP_HTML_Token
+	 * @var WP_HTML_Token|null
 	 */
 	private $context_node = null;
 
@@ -752,9 +752,10 @@ public function matches_breadcrumbs( $breadcrumbs ) {
 	 *       this returns false for self-closing elements in the
 	 *       SVG and MathML namespace.
 	 *
-	 * @param  ?WP_HTML_Token $node Node to examine instead of current node, if provided.
-	 * @return bool Whether to expect a closer for the currently-matched node,
-	 *              or `null` if not matched on any token.
+	 * @param WP_HTML_Token $node Node to examine instead of current node, if provided.
+	 *
+	 * @return bool|null Whether to expect a closer for the currently-matched node,
+	 *                   or `null` if not matched on any token.
 	 */
 	public function expects_closer( $node = null ) {
 		$token_name = $node->node_name ?? $this->get_token_name();

tests/phpunit/tests/html-api/wpHtmlProcessorHtml5lib.php

@@ -275,7 +275,7 @@ public static function parse_html5_dat_testfile( $filename ) {
 		/**
 		 * Represents which section of the test case is being parsed.
 		 *
-		 * @var ?string
+		 * @var string|null
 		 */
 		$state = null;