[PHP] Add UnsetCastRector

config/level/php/php72.yml

@@ -1,3 +1,4 @@
 services:
     Rector\Php\Rector\While_\WhileEachToForeachRector: ~
     Rector\Php\Rector\Each\ListEachRector: ~
+    Rector\Php\Rector\Unset_\UnsetCastRector: ~

ecs.yml

@@ -105,6 +105,7 @@ parameters:
             - '*Command.php'
             - '*NodeVisitor.php'
             - '*CompilerPass.php'
+            - 'packages/Php/src/Rector/Unset_/UnsetCastRector.php'
             # array type check
             - 'src/RectorDefinition/RectorDefinition.php'
 

packages/Php/src/Rector/Unset_/UnsetCastRector.php

@@ -0,0 +1,45 @@
+<?php declare(strict_types=1);
+
+namespace Rector\Php\Rector\Unset_;
+
+use PhpParser\Node;
+use PhpParser\Node\Expr\Cast\Unset_;
+use PhpParser\Node\Expr\ConstFetch;
+use PhpParser\Node\Name;
+use Rector\Rector\AbstractRector;
+use Rector\RectorDefinition\CodeSample;
+use Rector\RectorDefinition\RectorDefinition;
+
+final class UnsetCastRector extends AbstractRector
+{
+    public function getDefinition(): RectorDefinition
+    {
+        return new RectorDefinition('Removes (unset) cast', [
+            new CodeSample(
+                <<<'CODE_SAMPLE'
+$value = (unset) $value;
+CODE_SAMPLE
+                ,
+                <<<'CODE_SAMPLE'
+$value = null;
+CODE_SAMPLE
+            ),
+        ]);
+    }
+
+    /**
+     * @return string[]
+     */
+    public function getNodeTypes(): array
+    {
+        return [Unset_::class];
+    }
+
+    /**
+     * @param Unset_ $node
+     */
+    public function refactor(Node $node): ?Node
+    {
+        return new ConstFetch(new Name('null'));
+    }
+}

packages/Php/tests/Rector/Unset_/UnsetCastRector/Correct/correct.php.inc

@@ -0,0 +1,4 @@
+<?php
+
+$value = null;
+

packages/Php/tests/Rector/Unset_/UnsetCastRector/UnsetCastRectorTest.php

@@ -0,0 +1,30 @@
+<?php declare(strict_types=1);
+
+namespace Rector\Php\Tests\Rector\Unset_\UnsetCastRector;
+
+use Iterator;
+use Rector\Testing\PHPUnit\AbstractRectorTestCase;
+
+/**
+ * @covers \Rector\Php\Rector\Unset_\UnsetCastRector
+ */
+final class UnsetCastRectorTest extends AbstractRectorTestCase
+{
+    /**
+     * @dataProvider provideWrongToFixedFiles()
+     */
+    public function test(string $wrong, string $fixed): void
+    {
+        $this->doTestFileMatchesExpectedContent($wrong, $fixed);
+    }
+
+    public function provideWrongToFixedFiles(): Iterator
+    {
+        yield [__DIR__ . '/Wrong/wrong.php.inc', __DIR__ . '/Correct/correct.php.inc'];
+    }
+
+    protected function provideConfig(): string
+    {
+        return __DIR__ . '/config.yml';
+    }
+}

packages/Php/tests/Rector/Unset_/UnsetCastRector/Wrong/wrong.php.inc

@@ -0,0 +1,4 @@
+<?php
+
+$value = (unset) $value;
+

packages/Php/tests/Rector/Unset_/UnsetCastRector/config.yml

@@ -0,0 +1,2 @@
+services:
+    Rector\Php\Rector\Unset_\UnsetCastRector: ~