Online PHP editor | output for 8Trt8

<?php class Foo { private const string PREFIX = "Hello. "; private static string $prefix = "Hello, "; private static function prefix(): string { return "Hello, "; } public function greetFunc(string $to): string { return static::prefix() . $to . "!"; // passes, but insecure } public function greetVar(string $to): string { return static::$prefix . $to . "!"; // passes, but insecure } public function greetConst(string $to): string { return static::PREFIX . $to . "!"; // crashes immediately } } class Bar extends Foo { } echo (new Bar())->greetFunc("World") . PHP_EOL; echo (new Bar())->greetVar("World") . PHP_EOL; // echo (new Bar())->greetConst("World") . PHP_EOL; // Error! Referencing undefined Bar::PREFIX... class Buz extends Foo { protected const string PREFIX = "Hello. "; protected static string $prefix = "Hi, "; protected static function prefix(): string { return "Hi, "; } } echo (new Buz())->greetFunc("World") . PHP_EOL; // No! private function was actually overridden!! echo (new Buz())->greetVar("World") . PHP_EOL; // No! private property was actually overridden!! echo (new Buz())->greetConst("World") . PHP_EOL;