Try Rector Online | Rector - Automated Way to Instantly Upgrade and Refactor any PHP code

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

 
 class Test {
     function method() {
-        $prevErrorHandler = set_error_handler(function ($type, $msg, $file, $line, $context = []) use (&$prevErrorHandler, $signalingException) {
+        set_error_handler(function ($type, $msg, $file, $line, $context = []) use (&$prevErrorHandler, $signalingException) {
             if ($file === __FILE__) {
                 throw $signalingException;
             }

PHP snippet to change

<?php

class Test {
    function method() {
        $prevErrorHandler = set_error_handler(function ($type, $msg, $file, $line, $context = []) use (&$prevErrorHandler, $signalingException) {
            if ($file === __FILE__) {
                throw $signalingException;
            }

            return $prevErrorHandler !== null ? $prevErrorHandler($type, $msg, $file, $line, $context) : false;
        });
    }
}

Applied Rules:

RemoveUnusedVariableAssignRector

Not a change you expect?

Create an issue on GitHub
...or to speed up fix – add a test fixture

Config rector.php

<?php

use Rector\Config\RectorConfig;
use Rector\ValueObject\PhpVersion;
use Rector\DeadCode\Rector\Assign\RemoveUnusedVariableAssignRector;

return RectorConfig::configure()
    ->withRules([
        RemoveUnusedVariableAssignRector::class
    ])
    ->withPhpVersion(PhpVersion::PHP_84);

Rector version: 367edb - released at 2026-01-28 17:10