diff --git a/core/basepage.php b/core/basepage.php
index 37218343..1d7ae666 100644
--- a/core/basepage.php
+++ b/core/basepage.php
@@ -174,7 +174,7 @@ class BasePage
         $this->flash[] = $message;
     }
 
-    public function disable_left()
+    public function disable_left(): void
     {
         $this->left_enabled = false;
     }
@@ -480,7 +480,7 @@ class BasePage
     }
 
     /**
-     * @return array A list of stylesheets relative to the theme root.
+     * @return string[] A list of stylesheets relative to the theme root.
      */
     protected function get_theme_stylesheets(): array
     {
@@ -489,7 +489,7 @@ class BasePage
 
 
     /**
-     * @return array A list of script files relative to the theme root.
+     * @return string[] A list of script files relative to the theme root.
      */
     protected function get_theme_scripts(): array
     {
@@ -546,7 +546,7 @@ class BasePage
     /**
      * turns the Page into HTML
      */
-    public function render()
+    public function render(): void
     {
         global $config, $user;
 
@@ -643,7 +643,7 @@ class PageNavBuildingEvent extends Event
 {
     public array $links = [];
 
-    public function add_nav_link(string $name, Link $link, string $desc, ?bool $active = null, int $order = 50)
+    public function add_nav_link(string $name, Link $link, string $desc, ?bool $active = null, int $order = 50): void
     {
         $this->links[]  = new NavLink($name, $link, $desc, $active, $order);
     }
@@ -661,7 +661,7 @@ class PageSubNavBuildingEvent extends Event
         $this->parent = $parent;
     }
 
-    public function add_nav_link(string $name, Link $link, string|HTMLElement $desc, ?bool $active = null, int $order = 50)
+    public function add_nav_link(string $name, Link $link, string|HTMLElement $desc, ?bool $active = null, int $order = 50): void
     {
         $this->links[]  = new NavLink($name, $link, $desc, $active, $order);
     }
diff --git a/core/config.php b/core/config.php
index 35f06869..e403435a 100644
--- a/core/config.php
+++ b/core/config.php
@@ -234,7 +234,7 @@ abstract class BaseConfig implements Config
         return explode(",", $this->get($name, ""));
     }
 
-    private function get(string $name, $default = null)
+    private function get(string $name, $default = null): mixed
     {
         if (isset($this->values[$name])) {
             return $this->values[$name];
diff --git a/core/database.php b/core/database.php
index 72348dee..4c7c87dc 100644
--- a/core/database.php
+++ b/core/database.php
@@ -297,7 +297,7 @@ class Database
     /**
      * Execute an SQL query and return a single value, or null.
      */
-    public function get_one(string $query, array $args = [])
+    public function get_one(string $query, array $args = []): mixed
     {
         $_start = ftime();
         $row = $this->_execute($query, $args)->fetch();
diff --git a/core/dbengine.php b/core/dbengine.php
index 9c05c1a4..4467a296 100644
--- a/core/dbengine.php
+++ b/core/dbengine.php
@@ -16,7 +16,7 @@ abstract class DBEngine
 {
     public DatabaseDriverID $id;
 
-    public function init(PDO $db)
+    public function init(PDO $db): void
     {
     }
 
@@ -30,7 +30,7 @@ abstract class DBEngine
         return 'CREATE TABLE '.$name.' ('.$data.')';
     }
 
-    abstract public function set_timeout(PDO $db, ?int $time);
+    abstract public function set_timeout(PDO $db, ?int $time): void;
 
     abstract public function get_version(PDO $db): string;
 
@@ -41,7 +41,7 @@ class MySQL extends DBEngine
 {
     public DatabaseDriverID $id = DatabaseDriverID::MYSQL;
 
-    public function init(PDO $db)
+    public function init(PDO $db): void
     {
         $db->exec("SET NAMES utf8;");
     }
@@ -80,7 +80,7 @@ class PostgreSQL extends DBEngine
 {
     public DatabaseDriverID $id = DatabaseDriverID::PGSQL;
 
-    public function init(PDO $db)
+    public function init(PDO $db): void
     {
         if (array_key_exists('REMOTE_ADDR', $_SERVER)) {
             $db->exec("SET application_name TO 'shimmie [{$_SERVER['REMOTE_ADDR']}]';");
@@ -178,7 +178,7 @@ class SQLite extends DBEngine
 {
     public DatabaseDriverID $id = DatabaseDriverID::SQLITE;
 
-    public function init(PDO $db)
+    public function init(PDO $db): void
     {
         ini_set('sqlite.assoc_case', '0');
         $db->exec("PRAGMA foreign_keys = ON;");
diff --git a/core/extension.php b/core/extension.php
index ce82f4dc..c7364856 100644
--- a/core/extension.php
+++ b/core/extension.php
@@ -102,7 +102,7 @@ abstract class Extension
         return $config->get_int($name, 0);
     }
 
-    protected function set_version(string $name, int $ver)
+    protected function set_version(string $name, int $ver): void
     {
         global $config;
         $config->set_int($name, $ver);
@@ -188,7 +188,7 @@ abstract class ExtensionInfo
         return Extension::is_enabled($this->key);
     }
 
-    private function check_support()
+    private function check_support(): void
     {
         global $database;
         $this->support_info  = "";
@@ -243,7 +243,7 @@ abstract class ExtensionInfo
         }
     }
 
-    public static function load_all_extension_info()
+    public static function load_all_extension_info(): void
     {
         foreach (get_subclasses_of("Shimmie2\ExtensionInfo") as $class) {
             $extension_info = new $class();
diff --git a/core/imageboard/image.php b/core/imageboard/image.php
index 706e0e3a..abf3f515 100644
--- a/core/imageboard/image.php
+++ b/core/imageboard/image.php
@@ -208,7 +208,7 @@ class Image
         }
     }
 
-    public function save_to_db()
+    public function save_to_db(): void
     {
         global $database, $user;
         $cut_name = substr($this->filename, 0, 255);
diff --git a/core/imageboard/misc.php b/core/imageboard/misc.php
index 84d92ec9..402c9093 100644
--- a/core/imageboard/misc.php
+++ b/core/imageboard/misc.php
@@ -133,7 +133,7 @@ function get_thumbnail_max_size_scaled(): array
 }
 
 
-function create_image_thumb(Image $image, string $engine = null)
+function create_image_thumb(Image $image, string $engine = null): void
 {
     global $config;
     create_scaled_image(
@@ -148,8 +148,14 @@ function create_image_thumb(Image $image, string $engine = null)
 
 
 
-function create_scaled_image(string $inname, string $outname, array $tsize, string $mime, ?string $engine = null, ?string $resize_type = null)
-{
+function create_scaled_image(
+    string $inname,
+    string $outname,
+    array $tsize,
+    string $mime,
+    ?string $engine = null,
+    ?string $resize_type = null
+): void {
     global $config;
     if (empty($engine)) {
         $engine = $config->get_string(ImageConfig::THUMB_ENGINE);
diff --git a/core/install.php b/core/install.php
index 8014bed6..6cee3900 100644
--- a/core/install.php
+++ b/core/install.php
@@ -20,7 +20,7 @@ namespace Shimmie2;
  * and other such things that aren't ready yet
  */
 
-function install()
+function install(): void
 {
     date_default_timezone_set('UTC');
 
@@ -50,7 +50,7 @@ function install()
     }
 }
 
-function get_dsn()
+function get_dsn(): string
 {
     if (getenv("INSTALL_DSN")) {
         $dsn = getenv("INSTALL_DSN");
@@ -66,7 +66,7 @@ function get_dsn()
     return $dsn;
 }
 
-function do_install($dsn)
+function do_install(string $dsn): void
 {
     try {
         create_dirs();
@@ -77,7 +77,7 @@ function do_install($dsn)
     }
 }
 
-function ask_questions()
+function ask_questions(): void
 {
     $warnings = [];
     $errors = [];
@@ -187,7 +187,7 @@ EOD
 }
 
 
-function create_dirs()
+function create_dirs(): void
 {
     $data_exists = file_exists("data") || mkdir("data");
     $data_writable = $data_exists && (is_writable("data") || chmod("data", 0755));
@@ -204,7 +204,7 @@ function create_dirs()
     }
 }
 
-function create_tables(Database $db)
+function create_tables(Database $db): void
 {
     try {
         if ($db->count_tables() > 0) {
@@ -301,7 +301,7 @@ function create_tables(Database $db)
     }
 }
 
-function write_config($dsn)
+function write_config(string $dsn): void
 {
     $file_content = "<" . "?php\ndefine('DATABASE_DSN', '$dsn');\n";
 
diff --git a/core/logging.php b/core/logging.php
index a558e3c5..0d113724 100644
--- a/core/logging.php
+++ b/core/logging.php
@@ -31,7 +31,7 @@ const LOGGING_LEVEL_NAMES = [
  * When taking action, a log event should be stored by the server
  * Quite often, both of these happen at once, hence log_*() having $flash
  */
-function log_msg(string $section, int $priority, string $message, ?string $flash = null)
+function log_msg(string $section, int $priority, string $message, ?string $flash = null): void
 {
     global $page;
     send_event(new LogEvent($section, $priority, $message));
@@ -47,23 +47,23 @@ function log_msg(string $section, int $priority, string $message, ?string $flash
 }
 
 // More shorthand ways of logging
-function log_debug(string $section, string $message, ?string $flash = null)
+function log_debug(string $section, string $message, ?string $flash = null): void
 {
     log_msg($section, SCORE_LOG_DEBUG, $message, $flash);
 }
-function log_info(string $section, string $message, ?string $flash = null)
+function log_info(string $section, string $message, ?string $flash = null): void
 {
     log_msg($section, SCORE_LOG_INFO, $message, $flash);
 }
-function log_warning(string $section, string $message, ?string $flash = null)
+function log_warning(string $section, string $message, ?string $flash = null): void
 {
     log_msg($section, SCORE_LOG_WARNING, $message, $flash);
 }
-function log_error(string $section, string $message, ?string $flash = null)
+function log_error(string $section, string $message, ?string $flash = null): void
 {
     log_msg($section, SCORE_LOG_ERROR, $message, $flash);
 }
-function log_critical(string $section, string $message, ?string $flash = null)
+function log_critical(string $section, string $message, ?string $flash = null): void
 {
     log_msg($section, SCORE_LOG_CRITICAL, $message, $flash);
 }
diff --git a/core/polyfills.php b/core/polyfills.php
index c82c53a2..9ad1432b 100644
--- a/core/polyfills.php
+++ b/core/polyfills.php
@@ -253,6 +253,8 @@ function get_subclasses_of(string $parent): array
 
 /**
  * Like glob, with support for matching very long patterns with braces.
+ *
+ * @return string[]
  */
 function zglob(string $pattern): array
 {
@@ -763,7 +765,7 @@ function iterator_map_to_array(callable $callback, \iterator $iter): array
     return iterator_to_array(iterator_map($callback, $iter));
 }
 
-function stringer($s): string
+function stringer(mixed $s): string
 {
     if (is_array($s)) {
         if (isset($s[0])) {
@@ -798,7 +800,7 @@ function stringer($s): string
  * If a value is in the cache, return it; otherwise, call the callback
  * to generate it and store it in the cache.
  */
-function cache_get_or_set(string $key, callable $callback, ?int $ttl = null)
+function cache_get_or_set(string $key, callable $callback, ?int $ttl = null): mixed
 {
     global $cache;
     $value = $cache->get($key);
diff --git a/core/sanitize_php.php b/core/sanitize_php.php
index fca03915..8fbacdea 100644
--- a/core/sanitize_php.php
+++ b/core/sanitize_php.php
@@ -9,7 +9,7 @@ namespace Shimmie2;
  * be included right at the very start of index.php and tests/bootstrap.php
  */
 
-function die_nicely($title, $body, $code = 0)
+function die_nicely(string $title, string $body, int $code = 0): void
 {
     print("<!DOCTYPE html>
 <html lang='en'>
diff --git a/core/sys_config.php b/core/sys_config.php
index 1fea1fde..d6b7825b 100644
--- a/core/sys_config.php
+++ b/core/sys_config.php
@@ -17,7 +17,7 @@ namespace Shimmie2;
  *  define("SPEED_HAX", true);
  */
 
-function _d(string $name, $value): void
+function _d(string $name, mixed $value): void
 {
     if (!defined($name)) {
         define($name, $value);
diff --git a/core/testcase.php b/core/testcase.php
index 8995f92d..3bfd47bc 100644
--- a/core/testcase.php
+++ b/core/testcase.php
@@ -87,8 +87,12 @@ if(class_exists("\\PHPUnit\\Framework\\TestCase")) {
             return $args;
         }
 
-        protected static function request($method, $page_name, $get_args = null, $post_args = null): Page
-        {
+        protected static function request(
+            string $method,
+            string $page_name,
+            ?array $get_args = null,
+            ?array $post_args = null
+        ): Page {
             // use a fresh page
             global $page;
             $get_args = self::check_args($get_args);
@@ -108,12 +112,12 @@ if(class_exists("\\PHPUnit\\Framework\\TestCase")) {
             return $page;
         }
 
-        protected static function get_page($page_name, $args = null): Page
+        protected static function get_page(string $page_name, array $args = null): Page
         {
             return self::request("GET", $page_name, $args, null);
         }
 
-        protected static function post_page($page_name, $args = null): Page
+        protected static function post_page(string $page_name, array $args = null): Page
         {
             return self::request("POST", $page_name, null, $args);
         }
@@ -125,7 +129,7 @@ if(class_exists("\\PHPUnit\\Framework\\TestCase")) {
             $this->assertStringContainsString($title, $page->title);
         }
 
-        protected function assert_title_matches($title): void
+        protected function assert_title_matches(string $title): void
         {
             global $page;
             $this->assertStringMatchesFormat($title, $page->title);
@@ -190,7 +194,11 @@ if(class_exists("\\PHPUnit\\Framework\\TestCase")) {
             $this->assertStringNotContainsString($content, $page->data);
         }
 
-        protected function assert_search_results($tags, $results): void
+        /**
+         * @param string[] $tags
+         * @param int[] $results
+         */
+        protected function assert_search_results(array $tags, array $results): void
         {
             $images = Search::find_images(0, null, $tags);
             $ids = [];
diff --git a/core/tests/SearchTest.php b/core/tests/SearchTest.php
index 633610c0..a9b1be28 100644
--- a/core/tests/SearchTest.php
+++ b/core/tests/SearchTest.php
@@ -44,8 +44,12 @@ class SearchTest extends ShimmiePHPUnitTestCase
     /********************************************************
      * Test turning a string into an abstract query
      */
-    private function assert_TTC(string $tags, array $expected_tag_conditions, array $expected_img_conditions, string $expected_order)
-    {
+    private function assert_TTC(
+        string $tags,
+        array $expected_tag_conditions,
+        array $expected_img_conditions,
+        string $expected_order,
+    ): void {
         $class = new \ReflectionClass('\Shimmie2\Search');
         $terms_to_conditions = $class->getMethod("terms_to_conditions");
         $terms_to_conditions->setAccessible(true); // Use this if you are running PHP older than 8.1.0
@@ -149,7 +153,7 @@ class SearchTest extends ShimmiePHPUnitTestCase
         int $start = 0,
         array $res = [],
         array $path = null,
-    ) {
+    ): void {
         global $database;
 
         $tcs = array_map(
@@ -192,7 +196,7 @@ class SearchTest extends ShimmiePHPUnitTestCase
     * No-tag search      *
     * * * * * * * * * * */
     #[Depends('testUpload')]
-    public function testBSQ_NoTags($image_ids): void
+    public function testBSQ_NoTags(array $image_ids): void
     {
         $image_ids = $this->testUpload();
         $this->assert_BSQ(
@@ -206,7 +210,7 @@ class SearchTest extends ShimmiePHPUnitTestCase
     * Fast-path search   *
     * * * * * * * * * * */
     #[Depends('testUpload')]
-    public function testBSQ_FastPath_NoResults($image_ids): void
+    public function testBSQ_FastPath_NoResults(array $image_ids): void
     {
         $this->testUpload();
         $this->assert_BSQ(
@@ -217,7 +221,7 @@ class SearchTest extends ShimmiePHPUnitTestCase
     }
 
     #[Depends('testUpload')]
-    public function testBSQ_FastPath_OneResult($image_ids): void
+    public function testBSQ_FastPath_OneResult(array $image_ids): void
     {
         $image_ids = $this->testUpload();
         $this->assert_BSQ(
@@ -228,7 +232,7 @@ class SearchTest extends ShimmiePHPUnitTestCase
     }
 
     #[Depends('testUpload')]
-    public function testBSQ_FastPath_ManyResults($image_ids): void
+    public function testBSQ_FastPath_ManyResults(array $image_ids): void
     {
         $image_ids = $this->testUpload();
         $this->assert_BSQ(
@@ -239,7 +243,7 @@ class SearchTest extends ShimmiePHPUnitTestCase
     }
 
     #[Depends('testUpload')]
-    public function testBSQ_FastPath_WildNoResults($image_ids): void
+    public function testBSQ_FastPath_WildNoResults(array $image_ids): void
     {
         $this->testUpload();
         $this->assert_BSQ(
@@ -258,7 +262,7 @@ class SearchTest extends ShimmiePHPUnitTestCase
      * https://github.com/shish/shimmie2/issues/547
      */
     #[Depends('testUpload')]
-    public function testBSQ_FastPath_WildOneResult($image_ids): void
+    public function testBSQ_FastPath_WildOneResult(array $image_ids): void
     {
         $image_ids = $this->testUpload();
         $this->assert_BSQ(
@@ -273,7 +277,7 @@ class SearchTest extends ShimmiePHPUnitTestCase
      * when a wildcard matches one image multiple times.
      */
     #[Depends('testUpload')]
-    public function testBSQ_FastPath_WildManyResults($image_ids): void
+    public function testBSQ_FastPath_WildManyResults(array $image_ids): void
     {
         $image_ids = $this->testUpload();
         // two images match comp* - one matches it once, one matches it twice
@@ -288,7 +292,7 @@ class SearchTest extends ShimmiePHPUnitTestCase
     * General search     *
     * * * * * * * * * * */
     #[Depends('testUpload')]
-    public function testBSQ_GeneralPath_NoResults($image_ids): void
+    public function testBSQ_GeneralPath_NoResults(array $image_ids): void
     {
         $this->testUpload();
         # multiple tags, one of which doesn't exist
@@ -301,7 +305,7 @@ class SearchTest extends ShimmiePHPUnitTestCase
     }
 
     #[Depends('testUpload')]
-    public function testBSQ_GeneralPath_OneResult($image_ids): void
+    public function testBSQ_GeneralPath_OneResult(array $image_ids): void
     {
         $image_ids = $this->testUpload();
         $this->assert_BSQ(
@@ -320,7 +324,7 @@ class SearchTest extends ShimmiePHPUnitTestCase
      * https://github.com/shish/shimmie2/issues/547
      */
     #[Depends('testUpload')]
-    public function testBSQ_GeneralPath_WildOneResult($image_ids): void
+    public function testBSQ_GeneralPath_WildOneResult(array $image_ids): void
     {
         $image_ids = $this->testUpload();
         $this->assert_BSQ(
@@ -331,7 +335,7 @@ class SearchTest extends ShimmiePHPUnitTestCase
     }
 
     #[Depends('testUpload')]
-    public function testBSQ_GeneralPath_ManyResults($image_ids): void
+    public function testBSQ_GeneralPath_ManyResults(array $image_ids): void
     {
         $image_ids = $this->testUpload();
         $this->assert_BSQ(
@@ -342,7 +346,7 @@ class SearchTest extends ShimmiePHPUnitTestCase
     }
 
     #[Depends('testUpload')]
-    public function testBSQ_GeneralPath_WildManyResults($image_ids): void
+    public function testBSQ_GeneralPath_WildManyResults(array $image_ids): void
     {
         $image_ids = $this->testUpload();
         $this->assert_BSQ(
@@ -353,7 +357,7 @@ class SearchTest extends ShimmiePHPUnitTestCase
     }
 
     #[Depends('testUpload')]
-    public function testBSQ_GeneralPath_SubtractValidFromResults($image_ids): void
+    public function testBSQ_GeneralPath_SubtractValidFromResults(array $image_ids): void
     {
         $image_ids = $this->testUpload();
         $this->assert_BSQ(
@@ -364,7 +368,7 @@ class SearchTest extends ShimmiePHPUnitTestCase
     }
 
     #[Depends('testUpload')]
-    public function testBSQ_GeneralPath_SubtractNotValidFromResults($image_ids): void
+    public function testBSQ_GeneralPath_SubtractNotValidFromResults(array $image_ids): void
     {
         $image_ids = $this->testUpload();
         $this->assert_BSQ(
@@ -375,7 +379,7 @@ class SearchTest extends ShimmiePHPUnitTestCase
     }
 
     #[Depends('testUpload')]
-    public function testBSQ_GeneralPath_SubtractValidFromDefault($image_ids): void
+    public function testBSQ_GeneralPath_SubtractValidFromDefault(array $image_ids): void
     {
         $image_ids = $this->testUpload();
         // negative tag alone, should remove the image with that tag
@@ -387,7 +391,7 @@ class SearchTest extends ShimmiePHPUnitTestCase
     }
 
     #[Depends('testUpload')]
-    public function testBSQ_GeneralPath_SubtractNotValidFromDefault($image_ids): void
+    public function testBSQ_GeneralPath_SubtractNotValidFromDefault(array $image_ids): void
     {
         $image_ids = $this->testUpload();
         // negative that doesn't exist, should return all results
@@ -399,7 +403,7 @@ class SearchTest extends ShimmiePHPUnitTestCase
     }
 
     #[Depends('testUpload')]
-    public function testBSQ_GeneralPath_SubtractMultipleNotValidFromDefault($image_ids): void
+    public function testBSQ_GeneralPath_SubtractMultipleNotValidFromDefault(array $image_ids): void
     {
         $image_ids = $this->testUpload();
         // multiple negative tags that don't exist, should return all results
@@ -414,7 +418,7 @@ class SearchTest extends ShimmiePHPUnitTestCase
     * Meta Search        *
     * * * * * * * * * * */
     #[Depends('testUpload')]
-    public function testBSQ_ImgCond_NoResults($image_ids): void
+    public function testBSQ_ImgCond_NoResults(array $image_ids): void
     {
         $this->testUpload();
         $this->assert_BSQ(
@@ -430,7 +434,7 @@ class SearchTest extends ShimmiePHPUnitTestCase
     }
 
     #[Depends('testUpload')]
-    public function testBSQ_ImgCond_OneResult($image_ids): void
+    public function testBSQ_ImgCond_OneResult(array $image_ids): void
     {
         $image_ids = $this->testUpload();
         $this->assert_BSQ(
@@ -451,7 +455,7 @@ class SearchTest extends ShimmiePHPUnitTestCase
     }
 
     #[Depends('testUpload')]
-    public function testBSQ_ImgCond_ManyResults($image_ids): void
+    public function testBSQ_ImgCond_ManyResults(array $image_ids): void
     {
         $image_ids = $this->testUpload();
 
@@ -476,7 +480,7 @@ class SearchTest extends ShimmiePHPUnitTestCase
     * Mixed              *
     * * * * * * * * * * */
     #[Depends('testUpload')]
-    public function testBSQ_TagCondWithImgCond($image_ids): void
+    public function testBSQ_TagCondWithImgCond(array $image_ids): void
     {
         $image_ids = $this->testUpload();
         // multiple tags, many results
diff --git a/core/urls.php b/core/urls.php
index 845873e9..b715e1d5 100644
--- a/core/urls.php
+++ b/core/urls.php
@@ -24,6 +24,8 @@ class Link
 /**
  * Build a link to a search page for given terms,
  * with all the appropriate escaping
+ *
+ * @param string[] $terms
  */
 function search_link(array $terms = [], int $page = 1): string
 {
@@ -67,12 +69,19 @@ function make_link(?string $page = null, ?string $query = null, ?string $fragmen
 
 /**
  * Take the current URL and modify some parameters
+ *
+ * @param array<string, mixed> $changes
  */
 function modify_current_url(array $changes): string
 {
     return modify_url($_SERVER['REQUEST_URI'], $changes);
 }
 
+/**
+ * Take a URL and modify some parameters
+ *
+ * @param array<string, mixed> $changes
+ */
 function modify_url(string $url, array $changes): string
 {
     $parts = parse_url($url);
@@ -115,6 +124,8 @@ function make_http(string $link): string
 /**
  * If HTTP_REFERER is set, and not blacklisted, then return it
  * Else return a default $dest
+ *
+ * @param string[]|null $blacklist
  */
 function referer_or(string $dest, ?array $blacklist = null): string
 {
diff --git a/core/util.php b/core/util.php
index 0e6c81c4..dea379f9 100644
--- a/core/util.php
+++ b/core/util.php
@@ -536,6 +536,11 @@ function get_debug_info(): string
     return $debug;
 }
 
+/**
+ * Collects some debug information (execution time, memory usage, queries, etc)
+ *
+ * @return array<string, mixed>
+ */
 function get_debug_info_arr(): array
 {
     global $cache, $config, $_shm_event_count, $database, $_shm_load_start;
@@ -565,6 +570,9 @@ function get_debug_info_arr(): array
 * Request initialisation stuff                                              *
 \* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 
+/**
+ * @param string[] $files
+ */
 function require_all(array $files): void
 {
     foreach ($files as $filename) {