MDL-77350 search: Added class properties that are not declared

In PHP 8.2 and later, setting a value to an undeclared class property is
deprecated and emits a deprecation notice.
So we need to add missing class properties that still need to be declared.

search/classes/base.php

@@ -66,6 +66,13 @@ abstract class base {
      */
     protected static $levels = [CONTEXT_SYSTEM];
 
+    /**
+     * An area id from the componentname and the area name.
+     *
+     * @var string
+     */
+    public $areaid;
+
     /**
      * Constructor.
      *

search/classes/base_activity.php

@@ -54,6 +54,9 @@ abstract class base_activity extends base_mod {
      */
     protected static $levels = [CONTEXT_MODULE];
 
+    /** @var array activity data instance. */
+    public $activitiesdata = [];
+
     /**
      * Returns recordset containing all activities within the given context.
      *

search/engine/simpledb/tests/privacy/provider_test.php

@@ -42,6 +42,33 @@
  */
 class provider_test extends \core_privacy\tests\provider_testcase {
 
+    /** @var \search_simpledb\engine database engine. */
+    protected $engine;
+
+    /** @var \testable_core_search core search class adapted to unit test. */
+    protected $search;
+
+    /** @var \core_search_generator core search generator class adapted to unit test. */
+    protected $generator = null;
+
+    /** @var \stdClass course record.*/
+    protected $c1;
+
+    /** @var \stdClass course record.*/
+    protected $c2;
+
+    /** @var \context_course context instance. */
+    protected $c1context;
+
+    /** @var \context_course context instance. */
+    protected $c2context;
+
+    /** @var \stdClass user record. */
+    protected $u1;
+
+    /** @var \stdClass user record. */
+    protected $u2;
+
     public function setUp(): void {
         global $DB;
 

search/tests/fixtures/mock_search_engine.php

@@ -40,6 +40,9 @@ class engine extends \core_search\engine {
     /** @var array Schema updates applied */
     protected $schemaupdates = [];
 
+    /** @var array delete of course index. */
+    protected $deletes = [];
+
     public function is_installed() {
         return true;
     }