Rule source on GitHub

DowngradePipeOperatorRector

Downgrade pipe operator |> to PHP < 8.5 compatible code

 $value = "hello world";
-$result = $value
-    |> function3(...)
-    |> function2(...)
-    |> function1(...);
+$result1 = function3($value);
+$result2 = function2($result1);
+$result = function1($result2);

Configure your rector.php:

<?php

use Rector\Config\RectorConfig;
use Rector\DowngradePhp85\Rector\StmtsAwareInterface\DowngradePipeOperatorRector;

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