Support php 8.1

Author: TysonAndre

src/MissingToken.php

@@ -6,11 +6,14 @@
 
 namespace Microsoft\PhpParser;
 
+use ReturnTypeWillChange;
+
 class MissingToken extends Token {
     public function __construct(int $kind, int $fullStart) {
         parent::__construct($kind, $fullStart, $fullStart, 0);
     }
 
+    #[ReturnTypeWillChange]
     public function jsonSerialize() {
         return array_merge(
             ["error" => $this->getTokenKindNameFromValue(TokenKind::MissingToken)],

src/Node.php

@@ -11,6 +11,7 @@
 use Microsoft\PhpParser\Node\SourceFileNode;
 use Microsoft\PhpParser\Node\Statement\NamespaceDefinition;
 use Microsoft\PhpParser\Node\Statement\NamespaceUseDeclaration;
+use ReturnTypeWillChange;
 
 abstract class Node implements \JsonSerializable {
     const CHILD_NAMES = [];
@@ -380,6 +381,7 @@ protected function getChildrenKvPairs() {
         return $result;
     }
 
+    #[ReturnTypeWillChange]
     public function jsonSerialize() {
         $kindName = $this->getNodeKindName();
         return ["$kindName" => $this->getChildrenKvPairs()];

src/SkippedToken.php

@@ -6,11 +6,14 @@
 
 namespace Microsoft\PhpParser;
 
+use ReturnTypeWillChange;
+
 class SkippedToken extends Token {
     public function __construct(Token $token) {
         parent::__construct($token->kind, $token->fullStart, $token->start, $token->length);
     }
 
+    #[ReturnTypeWillChange]
     public function jsonSerialize() {
         return array_merge(
             ["error" => $this->getTokenKindNameFromValue(TokenKind::SkippedToken)],

src/Token.php

@@ -6,6 +6,8 @@
 
 namespace Microsoft\PhpParser;
 
+use ReturnTypeWillChange;
+
 use function substr;
 
 class Token implements \JsonSerializable {
@@ -110,6 +112,7 @@ public static function getTokenKindNameFromValue($kind) {
         return $mapToKindName[$kind] ?? $kind;
     }
 
+    #[ReturnTypeWillChange]
     public function jsonSerialize() {
         $kindName = $this->getTokenKindNameFromValue($this->kind);