Rector\Php70\Rector\Variable\WrapVariableVariableNameInCurlyBracesRector

WrapVariableVariableNameInCurlyBracesRector

Ensure variable variables are wrapped in curly braces

 function run($foo)
 {
-    global $$foo->bar;
+    global ${$foo->bar};
 }

Configure your rector.php:

<?php

use Rector\Config\RectorConfig;
use Rector\Php70\Rector\Variable\WrapVariableVariableNameInCurlyBracesRector;

return RectorConfig::configure()
    ->withRules([
        WrapVariableVariableNameInCurlyBracesRector::class,
    ]);

SETS: PHP 7.0