SingleInArrayToCompareRector

Changes in_array() with single element to ===

 class SomeClass
 {
     public function run()
     {
-        if (in_array(strtolower($type), ['$this'], true)) {
+        if (strtolower($type) === '$this') {
             return strtolower($type);
         }
     }
 }

Configure your rector.php:

<?php

use Rector\CodeQuality\Rector\FuncCall\SingleInArrayToCompareRector;
use Rector\Config\RectorConfig;

return RectorConfig::configure()
    ->withRules([
        SingleInArrayToCompareRector::class,
    ]);
SETS:  Code Quality