MbStrContainsRector

Find another rule

Replace mb_strpos() !== false and mb_strstr() with str_contains()

 class SomeClass
 {
     public function run()
     {
-        return mb_strpos('abc', 'a') !== false;
+        return str_contains('abc', 'a');
     }
 }

Configure your rector.php:

<?php

use Rector\Config\RectorConfig;
use Rector\Php80\Rector\NotIdentical\MbStrContainsRector;

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