Add static_lambda CS rule

.php_cs.dist

@@ -26,6 +26,7 @@ return PhpCsFixer\Config::create()
         'php_unit_test_class_requires_covers' => false,
         'phpdoc_order' => true,
         'phpdoc_types_order' => ['null_adjustment' => 'always_last'],
+        'static_lambda' => true,
         'ternary_to_null_coalescing' => true,
         'visibility_required' => ['property', 'method', 'const'],
         'void_return' => true,

CHANGELOG.md

@@ -19,6 +19,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * Added `symfony/deprecation-contracts` package to handle deprecations [#1823](https://github.com/ruflin/Elastica/pull/1823)
 * Added `list_syntax` CS rule [#1854](https://github.com/ruflin/Elastica/pull/1854)
 * Added `native_constant_invocation` CS rule [#1833](https://github.com/ruflin/Elastica/pull/1833)
+* Added `static_lambda` CS rule [#1870](https://github.com/ruflin/Elastica/pull/1870)
 * Added `Elastica\Aggregation\DateRange::setTimezone()` [#1847](https://github.com/ruflin/Elastica/pull/1847)
 ### Changed
 * Allow `string` such as `wait_for` to be passed to `AbstractUpdateAction::setRefresh` [#1791](https://github.com/ruflin/Elastica/pull/1791)

src/Transport/AwsAuthV4.php

@@ -43,7 +43,7 @@ private function getSigningMiddleware(): callable
         $signer = new SignatureV4('es', $region);
         $credProvider = $this->getCredentialProvider();
 
-        return Middleware::mapRequest(function (RequestInterface $req) use (
+        return Middleware::mapRequest(static function (RequestInterface $req) use (
             $signer,
             $credProvider
         ) {

tests/BulkTest.php

@@ -550,7 +550,7 @@ public function testUpsert(): void
         $doc2 = new Document(2, ['name' => 'Beckenbauer'], $index);
         $doc3 = new Document(3, ['name' => 'Baggio'], $index);
         $doc4 = new Document(4, ['name' => 'Cruyff'], $index);
-        $documents = \array_map(function ($d) {
+        $documents = \array_map(static function ($d) {
             $d->setDocAsUpsert(true);
 
             return $d;

tests/Connection/Strategy/CallbackStrategyTest.php

@@ -22,7 +22,7 @@ public function testInvoke(): void
     {
         $count = 0;
 
-        $callback = function ($connections) use (&$count): Connection {
+        $callback = static function ($connections) use (&$count): Connection {
             ++$count;
 
             return \current($connections);
@@ -42,7 +42,7 @@ public function testConnection(): void
     {
         $count = 0;
 
-        $config = ['connectionStrategy' => function ($connections) use (&$count): Connection {
+        $config = ['connectionStrategy' => static function ($connections) use (&$count): Connection {
             ++$count;
 
             return \current($connections);

tests/Connection/Strategy/RoundRobinTest.php

@@ -74,7 +74,7 @@ public function testWithOneFailConnection(): void
         ];
 
         $count = 0;
-        $callback = function ($connection, $exception, $client) use (&$count): void {
+        $callback = static function ($connection, $exception, $client) use (&$count): void {
             ++$count;
         };
 
@@ -102,7 +102,7 @@ public function testWithNoValidConnection(): void
         ];
 
         $count = 0;
-        $client = $this->_getClient(['roundRobin' => true], function () use (&$count): void {
+        $client = $this->_getClient(['roundRobin' => true], static function () use (&$count): void {
             ++$count;
         });
 

tests/Connection/Strategy/SimpleTest.php

@@ -62,7 +62,7 @@ public function testWithOneFailConnection(): void
         ];
 
         $count = 0;
-        $callback = function ($connection, $exception, $client) use (&$count): void {
+        $callback = static function ($connection, $exception, $client) use (&$count): void {
             ++$count;
         };
 
@@ -90,7 +90,7 @@ public function testWithNoValidConnection(): void
         ];
 
         $count = 0;
-        $client = $this->_getClient([], function () use (&$count): void {
+        $client = $this->_getClient([], static function () use (&$count): void {
             ++$count;
         });
 

tests/Connection/Strategy/StrategyFactoryTest.php

@@ -21,7 +21,7 @@ class StrategyFactoryTest extends Base
      */
     public function testCreateCallbackStrategy(): void
     {
-        $callback = function ($connections): void {
+        $callback = static function ($connections): void {
         };
 
         $strategy = StrategyFactory::create($callback);

tests/StatusTest.php

@@ -96,7 +96,7 @@ public function testAliasExists(): void
 
         $indicesWithAlias = $status->getIndicesWithAlias($aliasName);
         $this->assertEquals([$indexName], \array_map(
-            function ($index) {
+            static function ($index) {
                 return $index->getName();
             },
             $indicesWithAlias