Online PHP editor | output for s090m

<?php class Foo { private const string PREFIX = "Hello. "; private static string $prefix = "Hello, "; private function prefix(): string { return "Hello, "; } public function greetFunc(string $to): string { return static::prefix() . $to . "!"; // OK, but unnecessary LSB } public function greetVar(string $to): string { return static::$prefix . $to . "!"; // OK, but unnecessary LSB } public function greetConst(string $to): string { return static::PREFIX . $to . "!"; // It should be self::PREFIX. } } class Bar extends Foo { private static string $prefix = "Hi, "; private function prefix(): string { return "Hi, "; } } echo (new Bar())->greetFunc("World") . PHP_EOL; echo (new Bar())->greetVar("World") . PHP_EOL; echo (new Bar())->greetConst("World") . PHP_EOL; // Referencing undefined Bar::PREFIX...