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WrapEncapsedVariableInCurlyBracesRector

Wrap encapsed variables in curly braces

 function run($world)
 {
-    echo "Hello $world!";
+    echo "Hello {$world}!";
 }

Configure your rector.php:

<?php

use Rector\CodingStyle\Rector\Encapsed\WrapEncapsedVariableInCurlyBracesRector;
use Rector\Config\RectorConfig;

return RectorConfig::configure()
    ->withRules([
        WrapEncapsedVariableInCurlyBracesRector::class,
    ]);
SETS:  Coding Style