diff --git a/functionMap.php b/functionMap.php
index 89911d4..7b1082e 100644
--- a/functionMap.php
+++ b/functionMap.php
@@ -73,6 +73,7 @@
     'wp_schedule_event' => ['($wp_error is false ? bool : true|\WP_Error)', 'args' => $cronArgsType],
     'wp_schedule_single_event' => ['($wp_error is false ? bool : true|\WP_Error)', 'args' => $cronArgsType],
     'wp_slash' => ['T', '@phpstan-template' => 'T', 'value' => 'T'],
+    'wp_tag_cloud' => ["(\$args is array{format: 'array'} ? array<int, string>|void : (\$args is array{echo: false|0} ? string|void : void))"],
     'wp_unschedule_event' => ['($wp_error is false ? bool : true|\WP_Error)', 'args' => $cronArgsType],
     'wp_unslash' => ['T', '@phpstan-template' => 'T', 'value' => 'T'],
     'wp_widget_rss_form' => ['void', 'args' => $wpWidgetRssFormArgsType, 'inputs' => $wpWidgetRssFormInputsType],
diff --git a/tests/TypeInferenceTest.php b/tests/TypeInferenceTest.php
index b04f6db..9a9ad05 100644
--- a/tests/TypeInferenceTest.php
+++ b/tests/TypeInferenceTest.php
@@ -46,6 +46,7 @@ public function dataFileAsserts(): iterable
         yield from $this->gatherAssertTypes(__DIR__ . '/data/wp_list_pages.php');
         yield from $this->gatherAssertTypes(__DIR__ . '/data/wp_parse_list.php');
         yield from $this->gatherAssertTypes(__DIR__ . '/data/wp_rest_request.php');
+        yield from $this->gatherAssertTypes(__DIR__ . '/data/wp_tag_cloud.php');
         yield from $this->gatherAssertTypes(__DIR__ . '/data/wp_theme.php');
         yield from $this->gatherAssertTypes(__DIR__ . '/data/wpdb.php');
     }
diff --git a/tests/data/wp_tag_cloud.php b/tests/data/wp_tag_cloud.php
new file mode 100644
index 0000000..07a17d3
--- /dev/null
+++ b/tests/data/wp_tag_cloud.php
@@ -0,0 +1,48 @@
+<?php
+
+/**
+ * Note:
+ * Starting from PHPStan 1.10.49, void types, including void in unions, are
+ * transformed into null.
+ *
+ * @link https://github.com/phpstan/phpstan-src/pull/2778
+ */
+
+declare(strict_types=1);
+
+namespace PhpStubs\WordPress\Core\Tests;
+
+use function PHPStan\Testing\assertType;
+use function wp_tag_cloud;
+
+// Default value
+assertType('null', wp_tag_cloud());
+
+// Echo true
+assertType('null', wp_tag_cloud(['echo' => true]));
+assertType('null', wp_tag_cloud(['format' => 'flat', 'echo' => true]));
+assertType('null', wp_tag_cloud(['format' => 'list', 'echo' => true]));
+assertType('null', wp_tag_cloud(['format' => 'unexpected', 'echo' => true]));
+
+// Echo true, but format (maybe) array
+assertType('array<int, string>|null', wp_tag_cloud(['format' => 'array', 'echo' => true]));
+assertType('array<int, string>|null', wp_tag_cloud(['format' => (string)$_GET['format'], 'echo' => true]));
+
+// Echo false
+assertType('string|null', wp_tag_cloud(['echo' => false]));
+assertType('string|null', wp_tag_cloud(['format' => 'flat', 'echo' => false]));
+assertType('string|null', wp_tag_cloud(['format' => 'list', 'echo' => false]));
+assertType('array<int, string>|null', wp_tag_cloud(['format' => 'array', 'echo' => false]));
+assertType('string|null', wp_tag_cloud(['format' => 'unexpected', 'echo' => false]));
+assertType('array<int, string>|string|null', wp_tag_cloud(['format' => (string)$_GET['format'], 'echo' => false]));
+
+// Echo unknown
+/** @var bool|0|1 $echo */
+$boolZeroOne = $_GET['echo'];
+
+assertType('string|null', wp_tag_cloud(['echo' => $boolZeroOne]));
+assertType('string|null', wp_tag_cloud(['format' => 'flat', 'echo' => $boolZeroOne]));
+assertType('string|null', wp_tag_cloud(['format' => 'list', 'echo' => $boolZeroOne]));
+assertType('array<int, string>|null', wp_tag_cloud(['format' => 'array', 'echo' => $boolZeroOne]));
+assertType('string|null', wp_tag_cloud(['format' => 'unexpected', 'echo' => $boolZeroOne]));
+assertType('array<int, string>|string|null', wp_tag_cloud(['format' => (string)$_GET['format'], 'echo' => $boolZeroOne]));
diff --git a/wordpress-stubs.php b/wordpress-stubs.php
index 3b98d37..b4e8cfc 100644
--- a/wordpress-stubs.php
+++ b/wordpress-stubs.php
@@ -102180,6 +102180,7 @@ function wp_list_categories($args = '')
      *   topic_count_scale_callback?: callable,
      *   show_count?: bool|int,
      * } $args
+     * @phpstan-return ($args is array{format: 'array'} ? array<int, string>|void : ($args is array{echo: false|0} ? string|void : void))
      */
     function wp_tag_cloud($args = '')
     {