diff --git a/config/level/coding-style/coding-style.yml b/config/level/coding-style/coding-style.yml
index 0dd7a9adb4a..6ca81442326 100644
--- a/config/level/coding-style/coding-style.yml
+++ b/config/level/coding-style/coding-style.yml
@@ -4,3 +4,5 @@ services:
     Rector\CodingStyle\Rector\FuncCall\SimpleArrayCallableToStringRector: ~
     Rector\CodingStyle\Rector\Identical\IdenticalFalseToBooleanNotRector: ~
     Rector\CodingStyle\Rector\Switch_\BinarySwitchToIfElseRector: ~
+    Rector\CodingStyle\Rector\FuncCall\ConsistentImplodeRector: ~
+    Rector\CodingStyle\Rector\FuncCall\SetTypeToCastRector: ~
diff --git a/packages/CodingStyle/src/Rector/FuncCall/SetTypeToCastRector.php b/packages/CodingStyle/src/Rector/FuncCall/SetTypeToCastRector.php
new file mode 100644
index 00000000000..a42fee2da21
--- /dev/null
+++ b/packages/CodingStyle/src/Rector/FuncCall/SetTypeToCastRector.php
@@ -0,0 +1,124 @@
+<?php declare(strict_types=1);
+
+namespace Rector\CodingStyle\Rector\FuncCall;
+
+use PhpParser\Node;
+use PhpParser\Node\Arg;
+use PhpParser\Node\Expr;
+use PhpParser\Node\Expr\Assign;
+use PhpParser\Node\Expr\Cast\Array_;
+use PhpParser\Node\Expr\Cast\Bool_;
+use PhpParser\Node\Expr\Cast\Double;
+use PhpParser\Node\Expr\Cast\Int_;
+use PhpParser\Node\Expr\Cast\Object_;
+use PhpParser\Node\Expr\Cast\String_;
+use PhpParser\Node\Expr\FuncCall;
+use PhpParser\Node\Stmt\Expression;
+use Rector\NodeTypeResolver\Node\Attribute;
+use Rector\Rector\AbstractRector;
+use Rector\RectorDefinition\CodeSample;
+use Rector\RectorDefinition\RectorDefinition;
+
+/**
+ * @see https://stackoverflow.com/questions/5577003/using-settype-in-php-instead-of-typecasting-using-brackets-what-is-the-differen/5577068#5577068
+ * @see https://github.com/FriendsOfPHP/PHP-CS-Fixer/pull/3709
+ */
+final class SetTypeToCastRector extends AbstractRector
+{
+    /**
+     * @var string[]
+     */
+    private const TYPE_TO_CAST = [
+        'array' => Array_::class,
+        'bool' => Bool_::class,
+        'boolean' => Bool_::class,
+        'double' => Double::class,
+        'float' => Double::class,
+        'int' => Int_::class,
+        'integer' => Int_::class,
+        'object' => Object_::class,
+        'string' => String_::class,
+    ];
+
+    public function getDefinition(): RectorDefinition
+    {
+        return new RectorDefinition('Changes settype() to (type) where possible', [
+            new CodeSample(
+                <<<'CODE_SAMPLE'
+class SomeClass
+{
+    public function run($foo)
+    {
+        settype($foo, 'string');
+
+        return settype($foo, 'integer');
+    }
+}
+CODE_SAMPLE
+                ,
+                <<<'CODE_SAMPLE'
+class SomeClass
+{
+    public function run(array $items)
+    {
+        $foo = (string) $foo;
+
+        return (int) $foo;
+    }
+}
+CODE_SAMPLE
+            ),
+        ]);
+    }
+
+    /**
+     * @return string[]
+     */
+    public function getNodeTypes(): array
+    {
+        return [FuncCall::class];
+    }
+
+    /**
+     * @param FuncCall $node
+     */
+    public function refactor(Node $node): ?Node
+    {
+        if (! $this->isName($node, 'settype')) {
+            return null;
+        }
+
+        $typeNode = $this->getValue($node->args[1]->value);
+        if ($typeNode === null) {
+            return null;
+        }
+
+        $typeNode = strtolower($typeNode);
+
+        $varNode = $node->args[0]->value;
+        $parentNode = $node->getAttribute(Attribute::PARENT_NODE);
+
+        // result of function or probably used
+        if ($parentNode instanceof Expr || $parentNode instanceof Arg) {
+            return null;
+        }
+
+        if (isset(self::TYPE_TO_CAST[$typeNode])) {
+            $castClass = self::TYPE_TO_CAST[$typeNode];
+            $castNode = new $castClass($varNode);
+
+            if ($parentNode instanceof Expression) {
+                // bare expression? → assign
+                return new Assign($varNode, $castNode);
+            }
+
+            return $castNode;
+        }
+
+        if ($typeNode === 'null') {
+            return new Assign($varNode, $this->createNull());
+        }
+
+        return $node;
+    }
+}
diff --git a/packages/CodingStyle/tests/Rector/FuncCall/SetTypeToCastRector/Fixture/assign.php.inc b/packages/CodingStyle/tests/Rector/FuncCall/SetTypeToCastRector/Fixture/assign.php.inc
new file mode 100644
index 00000000000..e08322e2f70
--- /dev/null
+++ b/packages/CodingStyle/tests/Rector/FuncCall/SetTypeToCastRector/Fixture/assign.php.inc
@@ -0,0 +1,19 @@
+<?php
+
+namespace Rector\CodingStyle\Tests\Rector\FuncCall\SetTypeToCastRector\Fixture;
+
+class Assin
+{
+    public function run($foo)
+    {
+        $result = settype($foo, 'string');
+
+        is_bool(settype($foo, 'string'));
+
+        $result = [settype($foo, 'string')];
+
+        $result = [0 => settype($foo, 'string')];
+
+        settype($foo, settype($foo, 'string'));
+    }
+}
diff --git a/packages/CodingStyle/tests/Rector/FuncCall/SetTypeToCastRector/Fixture/fixture.php.inc b/packages/CodingStyle/tests/Rector/FuncCall/SetTypeToCastRector/Fixture/fixture.php.inc
new file mode 100644
index 00000000000..08d2080cb57
--- /dev/null
+++ b/packages/CodingStyle/tests/Rector/FuncCall/SetTypeToCastRector/Fixture/fixture.php.inc
@@ -0,0 +1,53 @@
+<?php
+
+namespace Rector\CodingStyle\Tests\Rector\FuncCall\SetTypeToCastRector\Fixture;
+
+class SomeClass
+{
+    public function run($foo)
+    {
+        settype($foo, 'string');
+        settype($foo, 'array');
+        settype($foo, 'INT');
+        settype($foo, 'float');
+        settype($foo, 'double');
+        settype($foo, 'bool');
+        settype($foo, 'boolean');
+
+        return settype($foo, 'integer');
+    }
+
+    public function null()
+    {
+        settype($foo, 'null');
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\CodingStyle\Tests\Rector\FuncCall\SetTypeToCastRector\Fixture;
+
+class SomeClass
+{
+    public function run($foo)
+    {
+        $foo = (string) $foo;
+        $foo = (array) $foo;
+        $foo = (int) $foo;
+        $foo = (double) $foo;
+        $foo = (double) $foo;
+        $foo = (bool) $foo;
+        $foo = (bool) $foo;
+
+        return (int) $foo;
+    }
+
+    public function null()
+    {
+        $foo = null;
+    }
+}
+
+?>
diff --git a/packages/CodingStyle/tests/Rector/FuncCall/SetTypeToCastRector/SetTypeToCastRectorTest.php b/packages/CodingStyle/tests/Rector/FuncCall/SetTypeToCastRector/SetTypeToCastRectorTest.php
new file mode 100644
index 00000000000..00e8593ad84
--- /dev/null
+++ b/packages/CodingStyle/tests/Rector/FuncCall/SetTypeToCastRector/SetTypeToCastRectorTest.php
@@ -0,0 +1,19 @@
+<?php declare(strict_types=1);
+
+namespace Rector\CodingStyle\Tests\Rector\FuncCall\SetTypeToCastRector;
+
+use Rector\CodingStyle\Rector\FuncCall\SetTypeToCastRector;
+use Rector\Testing\PHPUnit\AbstractRectorTestCase;
+
+final class SetTypeToCastRectorTest extends AbstractRectorTestCase
+{
+    public function test(): void
+    {
+        $this->doTestFiles([__DIR__ . '/Fixture/fixture.php.inc', __DIR__ . '/Fixture/assign.php.inc']);
+    }
+
+    protected function getRectorClass(): string
+    {
+        return SetTypeToCastRector::class;
+    }
+}