IfToNullCoalescingAssignRector

Change if null guard with single assign to null coalescing assign ??=

-if (! isset($array['user_id'])) {
-    $array['user_id'] = 'value';
-}
+$array['user_id'] ??= 'value';

Configure your rector.php:

<?php

use Rector\Config\RectorConfig;
use Rector\Php74\Rector\If_\IfToNullCoalescingAssignRector;

return RectorConfig::configure()
    ->withRules([
        IfToNullCoalescingAssignRector::class,
    ]);
SETS:  PHP 7.4