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Run Rector on your code to see what it can do for you:

// no change

PHP snippet to change

<?php

declare(strict_types=1);

namespace Rector\Tests\Php81\Rector\Property\ReadOnlyPropertyRector\Fixture;

use PDO;

class A
{
    public function __construct(
        private int $id
    ) {
    }

    public function prepare(): void
    {
        $dsn = 'mysql:dbname=testdb;host=127.0.0.1';
        $user = 'dbuser';
        $password = 'dbpass';

        $dbh = new PDO($dsn, $user, $password);
        $sth = $dbh->prepare('SELECT * FROM users WHERE id = :id');
        
        if (! $sth instanceof \PDOStatement) {
             return;
        }
        
        $sth->bindParam('id', $this->id, PDO::PARAM_INT);
        $sth->execute();
    }
}

Config rector.php

<?php

use Rector\Config\RectorConfig;
use Rector\TypeDeclaration\Rector\Property\TypedPropertyFromAssignsRector;

return RectorConfig::configure()
    ->withRules([
        \Rector\Php81\Rector\Property\ReadOnlyPropertyRector::class
    ]);

Rector version: 180d36 - released at 2025-09-17 03:01