Rule source on GitHub

DowngradePhpTokenRector

"something()" will be renamed to "somethingElse()"

-$tokens = \PhpToken::tokenize($code);
+$tokens = token_get_all($code);

-foreach ($tokens as $phpToken) {
-   $name = $phpToken->getTokenName();
-   $text = $phpToken->text;
+foreach ($tokens as $token) {
+    $name = is_array($token) ? token_name($token[0]) : null;
+    $text = is_array($token) ? $token[1] : $token;
 }

Configure your rector.php:

<?php

use Rector\Config\RectorConfig;
use Rector\DowngradePhp80\Rector\StaticCall\DowngradePhpTokenRector;

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