diff --git a/.gitignore b/.gitignore
index f1fb048..d3b3a3d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -29,3 +29,4 @@ 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 c809122..e9cea90 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 8d03629..6295dce 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,7 +2,7 @@
 
 ## 2.0.1 under development
 
-- no changes in this release.
+Enh #246: Explicitly import functions and constants in "use" section (@mspirkov)
 
 ## 2.0.0 December 13, 2025
 
diff --git a/src/Paginator/KeysetPaginator.php b/src/Paginator/KeysetPaginator.php
index 25481bc..b68e13e 100644
--- a/src/Paginator/KeysetPaginator.php
+++ b/src/Paginator/KeysetPaginator.php
@@ -25,6 +25,9 @@
 use function reset;
 use function sprintf;
 
+use const SORT_ASC;
+use const SORT_DESC;
+
 /**
  * Keyset paginator.
  *
diff --git a/src/Reader/Iterable/IterableDataReader.php b/src/Reader/Iterable/IterableDataReader.php
index 1c1675f..064a9aa 100644
--- a/src/Reader/Iterable/IterableDataReader.php
+++ b/src/Reader/Iterable/IterableDataReader.php
@@ -33,6 +33,8 @@
 use function iterator_to_array;
 use function uasort;
 
+use const SORT_DESC;
+
 /**
  * Iterable data reader takes iterable data as a source and can:
  *
diff --git a/src/Reader/OrderHelper.php b/src/Reader/OrderHelper.php
index bcf01ea..d329c69 100644
--- a/src/Reader/OrderHelper.php
+++ b/src/Reader/OrderHelper.php
@@ -9,6 +9,8 @@
 use function substr;
 use function trim;
 
+use const PREG_SPLIT_NO_EMPTY;
+
 /**
  * @psalm-import-type TOrder from Sort
  */
diff --git a/src/Reader/Sort.php b/src/Reader/Sort.php
index 795b9d2..33a4e55 100644
--- a/src/Reader/Sort.php
+++ b/src/Reader/Sort.php
@@ -12,6 +12,9 @@
 use function is_int;
 use function is_string;
 
+use const SORT_ASC;
+use const SORT_DESC;
+
 /**
  * Sort represents data sorting settings:
  *
diff --git a/tests/Paginator/KeysetPaginatorTest.php b/tests/Paginator/KeysetPaginatorTest.php
index 34873b5..07edfe9 100644
--- a/tests/Paginator/KeysetPaginatorTest.php
+++ b/tests/Paginator/KeysetPaginatorTest.php
@@ -34,6 +34,8 @@
 use function reset;
 use function sprintf;
 
+use const SORT_ASC;
+
 final class KeysetPaginatorTest extends TestCase
 {
     use PageTokenAssertTrait;
diff --git a/tests/Paginator/OffsetPaginatorTest.php b/tests/Paginator/OffsetPaginatorTest.php
index 3999f18..52a850f 100644
--- a/tests/Paginator/OffsetPaginatorTest.php
+++ b/tests/Paginator/OffsetPaginatorTest.php
@@ -23,6 +23,8 @@
 use Yiisoft\Data\Tests\Support\StubOffsetData;
 use Yiisoft\Data\Tests\TestCase;
 
+use function sprintf;
+
 final class OffsetPaginatorTest extends TestCase
 {
     use PageTokenAssertTrait;
diff --git a/tests/Reader/SortTest.php b/tests/Reader/SortTest.php
index e52f949..9d34b32 100644
--- a/tests/Reader/SortTest.php
+++ b/tests/Reader/SortTest.php
@@ -9,6 +9,9 @@
 use Yiisoft\Data\Reader\Sort;
 use Yiisoft\Data\Tests\TestCase;
 
+use const SORT_ASC;
+use const SORT_DESC;
+
 final class SortTest extends TestCase
 {
     public function testInvalidConfigWithoutFieldName(): void
diff --git a/tests/Support/MutationDataReader.php b/tests/Support/MutationDataReader.php
index 85567e2..186fbdd 100644
--- a/tests/Support/MutationDataReader.php
+++ b/tests/Support/MutationDataReader.php
@@ -13,6 +13,8 @@
 use Yiisoft\Data\Reader\Sort;
 use Yiisoft\Data\Reader\SortableDataInterface;
 
+use function call_user_func;
+
 final class MutationDataReader implements
     ReadableDataInterface,
     FilterableDataInterface,