Feat: Add SimpleToComplexStringVariableFixer for PHP 8.2+ (part of #94)

Author: OndraM

ecs.php

@@ -145,6 +145,7 @@
 use PhpCsFixer\Fixer\Strict\StrictComparisonFixer;
 use PhpCsFixer\Fixer\Strict\StrictParamFixer;
 use PhpCsFixer\Fixer\StringNotation\MultilineStringToHeredocFixer;
+use PhpCsFixer\Fixer\StringNotation\SimpleToComplexStringVariableFixer;
 use PhpCsFixer\Fixer\StringNotation\SingleQuoteFixer;
 use PhpCsFixer\Fixer\Whitespace\ArrayIndentationFixer;
 use PhpCsFixer\Fixer\Whitespace\BlankLineBeforeStatementFixer;
@@ -408,6 +409,8 @@
             StrictComparisonFixer::class,
             // Convert multiline string to heredoc or nowdoc.
             MultilineStringToHeredocFixer::class,
+            // Converts explicit variables in double-quoted strings from simple to complex format (${ to {$).
+            SimpleToComplexStringVariableFixer::class,
             // Convert double quotes to single quotes for simple strings
             SingleQuoteFixer::class,
             // Each element of an array must be indented exactly once.

tests/Integration/CodingStandardTest.php

@@ -53,6 +53,20 @@ public function shouldFixPhp81(): void
         );
     }
 
+    /**
+     * @test
+     * @requires PHP >= 8.2
+     */
+    public function shouldFixPhp82(): void
+    {
+        $fixedFile = $this->runEcsCheckOnFile(__DIR__ . '/Fixtures/Php82.wrong.php.inc');
+
+        $this->assertStringEqualsFile(
+            __DIR__ . '/Fixtures/Php82.correct.php.inc',
+            file_get_contents($fixedFile),
+        );
+    }
+
     private function runEcsCheckOnFile(string $file): string
     {
         $fixtureFile = $this->initTempFixtureFile();

tests/Integration/Fixtures/Php82.correct.php.inc

@@ -0,0 +1,12 @@
+<?php declare(strict_types=1);
+
+namespace Lmc\CodingStandard\Integration\Fixtures;
+
+class Php82
+{
+    public function php82features(): void
+    {
+        $name = 'John';
+        $complexString = "Hello {$name}!";
+    }
+}

tests/Integration/Fixtures/Php82.wrong.php.inc

@@ -0,0 +1,12 @@
+<?php declare(strict_types=1);
+
+namespace Lmc\CodingStandard\Integration\Fixtures;
+
+class Php82
+{
+    public function php82features(): void
+    {
+        $name = 'John';
+        $complexString = "Hello ${name}!";
+    }
+}