3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php class Qwe { public ${''} = 20; public function __construct(){ echo $this->{''}.PHP_EOL; } } ${''}=10; echo ${''}.PHP_EOL; // 10 echo ${null}.PHP_EOL; // 10 $b = new Qwe;