<?php class Base { public static function describe() { echo "--> " . ($calculated = "I am a " . get_called_class() . "\n"); static $cached = null; if ($cached === null) { $cached = $calculated; } return $cached; } } class Animal extends Base { public static function describe() { return 'Hello! ' . parent::describe(); } } class Cat extends Animal { } class Dog extends Animal { } echo Cat::describe(); echo Dog::describe(); echo Animal::describe();
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