ShortenElseIfRector

Shortens else/if to elseif

 class SomeClass
 {
     public function run()
     {
         if ($cond1) {
             return $action1;
-        } else {
-            if ($cond2) {
-                return $action2;
-            }
+        } elseif ($cond2) {
+            return $action2;
         }
     }
 }

Configure your rector.php:

<?php

use Rector\CodeQuality\Rector\If_\ShortenElseIfRector;
use Rector\Config\RectorConfig;

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