Online PHP editor | output for 9bXe9

<?php class HelloWorld { static int $staticInt = 5; public function sayHello(): void { if (HelloWorld::someValue() === 5) { doFoo(function () { print 'HelloWorld::someValue(): ' . HelloWorld::someValue() . "\n"; }); } } public static function someValue(): int { return static::$staticInt; } } function doFoo(callable $cb): void { HelloWorld::$staticInt = 42; $cb(); } (new HelloWorld)->sayHello();