3v4l.org

run code in 300+ PHP versions simultaneously
<?php declare(strict_types = 1); trait foo { public function getFoo() { return new class { use foo; }; } } class HelloWorld { use foo; } var_dump((new HelloWorld())->getFoo()->getFoo());
Output for 7.4.0 - 7.4.29, 8.0.1 - 8.0.18, 8.1.0 - 8.1.5
object(class@anonymous)#1 (0) { }

preferences:
191.06 ms | 1400 KiB | 59 Q