Online PHP editor | output for rZk6Z

<?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 . $to . "!"; // It should be self::$prefix. } public function greetConst(string $to): string { return static::PREFIX . $to . "!"; // It should be self::PREFIX. } } class Bar extends Foo { } echo (new Bar())->greetFunc("World") . PHP_EOL; // Actually using Foo::prefix() instead of Bar::prefix() echo (new Bar())->greetVar("World") . PHP_EOL; // Referencing undefined Bar::$prefix... echo (new Bar())->greetConst("World") . PHP_EOL; // Referencing undefined Bar::PREFIX...