[DeadCode] Add RemoveConcatAutocastRector

config/level/dead-code/dead-code.yaml

@@ -17,3 +17,4 @@ services:
     Rector\DeadCode\Rector\For_\RemoveDeadIfForeachForRector: ~
     Rector\DeadCode\Rector\BooleanAnd\RemoveAndTrueRector: ~
     Rector\DeadCode\Rector\MethodCall\RemoveDefaultArgumentValueRector: ~
+    Rector\DeadCode\Rector\Concat\RemoveConcatAutocastRector: ~

packages/DeadCode/src/Rector/Concat/RemoveConcatAutocastRector.php

@@ -0,0 +1,63 @@
+<?php declare(strict_types=1);
+
+namespace Rector\DeadCode\Rector\Concat;
+
+use PhpParser\Node;
+use PhpParser\Node\Expr\BinaryOp\Concat;
+use Rector\Rector\AbstractRector;
+use Rector\RectorDefinition\CodeSample;
+use Rector\RectorDefinition\RectorDefinition;
+
+final class RemoveConcatAutocastRector extends AbstractRector
+{
+    public function getDefinition(): RectorDefinition
+    {
+        return new RectorDefinition('Remove (string) casting when it comes to concat, that does this by default', [
+            new CodeSample(
+                <<<'CODE_SAMPLE'
+class SomeConcatingClass
+{
+    public function run($value)
+    {
+        return 'hi ' . (string) $value;
+    }
+}
+CODE_SAMPLE
+                ,
+                <<<'CODE_SAMPLE'
+class SomeConcatingClass
+{
+    public function run($value)
+    {
+        return 'hi ' . $value;
+    }
+}
+CODE_SAMPLE
+            ),
+        ]);
+    }
+
+    /**
+     * @return string[]
+     */
+    public function getNodeTypes(): array
+    {
+        return [Concat::class];
+    }
+
+    /**
+     * @param Concat $node
+     */
+    public function refactor(Node $node): ?Node
+    {
+        $node->left = $this->removeStringCast($node->left);
+        $node->right = $this->removeStringCast($node->right);
+
+        return $node;
+    }
+
+    private function removeStringCast(Node\Expr $expr): Node
+    {
+        return $expr instanceof Node\Expr\Cast\String_ ? $expr->expr : $expr;
+    }
+}

packages/DeadCode/tests/Rector/Concat/RemoveConcatAutocastRector/Fixture/fixture.php.inc

@@ -0,0 +1,27 @@
+<?php
+
+namespace Rector\DeadCode\Tests\Rector\Concat\RemoveConcatAutocastRector\Fixture;
+
+class SomeConcatingClass
+{
+    public function run($value)
+    {
+        return 'hi ' . (string) $value;
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\DeadCode\Tests\Rector\Concat\RemoveConcatAutocastRector\Fixture;
+
+class SomeConcatingClass
+{
+    public function run($value)
+    {
+        return 'hi ' . $value;
+    }
+}
+
+?>

packages/DeadCode/tests/Rector/Concat/RemoveConcatAutocastRector/RemoveConcatAutocastRectorTest.php

@@ -0,0 +1,19 @@
+<?php declare(strict_types=1);
+
+namespace Rector\DeadCode\Tests\Rector\Concat\RemoveConcatAutocastRector;
+
+use Rector\DeadCode\Rector\Concat\RemoveConcatAutocastRector;
+use Rector\Testing\PHPUnit\AbstractRectorTestCase;
+
+final class RemoveConcatAutocastRectorTest extends AbstractRectorTestCase
+{
+    public function test(): void
+    {
+        $this->doTestFiles([__DIR__ . '/Fixture/fixture.php.inc']);
+    }
+
+    protected function getRectorClass(): string
+    {
+        return RemoveConcatAutocastRector::class;
+    }
+}