diff --git a/.github/workflows/rector-cs.yml b/.github/workflows/rector-cs.yml
index d6a42ee5f..3982a9c75 100644
--- a/.github/workflows/rector-cs.yml
+++ b/.github/workflows/rector-cs.yml
@@ -24,6 +24,6 @@ jobs:
       token: ${{ secrets.YIISOFT_GITHUB_TOKEN }}
     with:
       repository: ${{ github.event.pull_request.head.repo.full_name }}
-      php: '8.5'
+      php: '8.1'
       required-packages: >-
         ['db']
diff --git a/.gitignore b/.gitignore
index 391f24727..48e431101 100644
--- a/.gitignore
+++ b/.gitignore
@@ -36,3 +36,4 @@ composer.phar
 
 # PHP CS Fixer
 /.php-cs-fixer.cache
+/.php-cs-fixer.php
diff --git a/.php-cs-fixer.dist.php b/.php-cs-fixer.dist.php
index c8091220b..e9cea90b9 100644
--- a/.php-cs-fixer.dist.php
+++ b/.php-cs-fixer.dist.php
@@ -12,11 +12,23 @@
 ]);
 
 return (new Config())
+    ->setRiskyAllowed(true)
     ->setParallelConfig(ParallelConfigFactory::detect())
     ->setRules([
         '@PER-CS3.0' => true,
         'no_unused_imports' => true,
         'ordered_class_elements' => true,
         'class_attributes_separation' => ['elements' => ['method' => 'one']],
+        'declare_strict_types' => true,
+        'native_function_invocation' => true,
+        'native_constant_invocation' => true,
+        'fully_qualified_strict_types' => [
+            'import_symbols' => true
+        ],
+        'global_namespace_import' => [
+            'import_classes' => true,
+            'import_constants' => true,
+            'import_functions' => true,
+        ],
     ])
     ->setFinder($finder);
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0ab1cd132..ee1b976a4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
 
 - Enh #477, #478: Improve performance of `ArrayParser::parse()` method (@Tigrov)
 - Enh #478: Improve performance of `StructuredParser::parse()` method (@Tigrov)
+- Enh #479: Explicitly import functions and constants in "use" section (@mspirkov)
 
 ## 2.0.0 December 05, 2025
 
diff --git a/src/Column/BitColumn.php b/src/Column/BitColumn.php
index 9722242e8..9f177562c 100644
--- a/src/Column/BitColumn.php
+++ b/src/Column/BitColumn.php
@@ -9,6 +9,7 @@
 use Yiisoft\Db\Schema\Column\AbstractColumn;
 
 use function bindec;
+use function is_string;
 
 final class BitColumn extends AbstractColumn
 {
diff --git a/src/Column/ColumnBuilder.php b/src/Column/ColumnBuilder.php
index 85daba878..f489edcb1 100644
--- a/src/Column/ColumnBuilder.php
+++ b/src/Column/ColumnBuilder.php
@@ -9,6 +9,8 @@
 use Yiisoft\Db\Schema\Column\DateTimeColumn;
 use Yiisoft\Db\Schema\Column\DoubleColumn;
 
+use const PHP_INT_SIZE;
+
 final class ColumnBuilder extends \Yiisoft\Db\Schema\Column\ColumnBuilder
 {
     public static function boolean(): BooleanColumn
diff --git a/src/Column/RangeBoundColumnFactory.php b/src/Column/RangeBoundColumnFactory.php
index 6008dbb8e..a3180ebef 100644
--- a/src/Column/RangeBoundColumnFactory.php
+++ b/src/Column/RangeBoundColumnFactory.php
@@ -8,6 +8,8 @@
 use Yiisoft\Db\Schema\Column\DateTimeColumn;
 use Yiisoft\Db\Schema\Column\DoubleColumn;
 
+use const PHP_INT_SIZE;
+
 /**
  * @internal
  */
diff --git a/tests/CommandTest.php b/tests/CommandTest.php
index 31e5e5231..4dc25b838 100644
--- a/tests/CommandTest.php
+++ b/tests/CommandTest.php
@@ -15,6 +15,7 @@
 use Yiisoft\Db\Tests\Common\CommonCommandTest;
 
 use function serialize;
+use function strlen;
 
 /**
  * @group pgsql
diff --git a/tests/Provider/QueryBuilderProvider.php b/tests/Provider/QueryBuilderProvider.php
index 8b90aba21..0ef78c864 100644
--- a/tests/Provider/QueryBuilderProvider.php
+++ b/tests/Provider/QueryBuilderProvider.php
@@ -628,7 +628,7 @@ public static function multiOperandFunctionBuilder(): iterable
         ];
         $data['Longest with 3 operands'][2] = "(SELECT value FROM (SELECT :qp0 AS value UNION SELECT (SELECT 'longest'::text)"
             . ' AS value UNION SELECT :qp1 AS value) AS t ORDER BY LENGTH(value) DESC LIMIT 1)';
-        $data['Shortest with 3 operands'][1] = static fn(Connectioninterface $db) => [
+        $data['Shortest with 3 operands'][1] = static fn(ConnectionInterface $db) => [
             new Value('short'),
             $db->select(new Expression("'longest'::text")),
             new Param('string', DataType::STRING),
diff --git a/tests/Provider/SchemaProvider.php b/tests/Provider/SchemaProvider.php
index eecc595d0..834deda1b 100644
--- a/tests/Provider/SchemaProvider.php
+++ b/tests/Provider/SchemaProvider.php
@@ -26,6 +26,8 @@
 use Yiisoft\Db\Schema\Column\StringColumn;
 use Yiisoft\Db\Tests\Support\Assert;
 
+use function sprintf;
+
 final class SchemaProvider extends \Yiisoft\Db\Tests\Provider\SchemaProvider
 {
     public static function columns(): array
diff --git a/tests/SchemaTest.php b/tests/SchemaTest.php
index 3a9b4bd82..fa585573e 100644
--- a/tests/SchemaTest.php
+++ b/tests/SchemaTest.php
@@ -23,6 +23,8 @@
 use Yiisoft\Db\Tests\Common\CommonSchemaTest;
 use Yiisoft\Db\Tests\Support\TestHelper;
 
+use function count;
+
 /**
  * @group pgsql
  */