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

Rector 2.6.6 (hash bff669) · from 2026-09-10

Your PHP code Suggested changes

<?php

namespace App\Foo;

class Bar {}

echo '\App\Foo\Bar' . PHP_EOL;
echo 'App\Foo\Bar' . PHP_EOL;

$database_data = 'App\Foo\Bar';
var_dump('\App\Foo\Bar' == 'App\Foo\Bar');

if ($database_data == '\App\Foo\Bar' || $database_data == 'App\Foo\Bar') {
  echo 'Matches' . PHP_EOL;
}

 <?php
 
 namespace App\Foo;
 
 class Bar {}
 
-echo '\App\Foo\Bar' . PHP_EOL;
-echo 'App\Foo\Bar' . PHP_EOL;
+echo \App\Foo\Bar::class . PHP_EOL;
+echo \App\Foo\Bar::class . PHP_EOL;
 
-$database_data = 'App\Foo\Bar';
-var_dump('\App\Foo\Bar' == 'App\Foo\Bar');
+$database_data = \App\Foo\Bar::class;
+var_dump(\App\Foo\Bar::class == \App\Foo\Bar::class);
 
-if ($database_data == '\App\Foo\Bar' || $database_data == 'App\Foo\Bar') {
+if ($database_data == \App\Foo\Bar::class || $database_data == \App\Foo\Bar::class) {
   echo 'Matches' . PHP_EOL;
 }

Applied Rules:

StringClassNameToClassConstantRector

Config rector.php

<?php

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

return RectorConfig::configure()
    // B. or few rules
    ->withRules([
                \Rector\Php55\Rector\String_\StringClassNameToClassConstantRector::class
    ])
    // demonstrate specific PHP version
    ->withPhpVersion(PhpVersion::PHP_84);