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<?php class Base { protected static $cached = null; public static function describe() { echo "--> " . ($calculated = "I am a " . get_called_class() . "\n"); if (static::$cached === null) { static::$cached = $calculated; } return static::$cached; } } class Animal extends Base { } class Cat extends Animal { } class Dog extends Animal { } echo Cat::describe(); echo Dog::describe(); echo Animal::describe();
Output for git.master, git.master_jit, rfc.property-hooks
--> I am a Cat I am a Cat --> I am a Dog I am a Cat --> I am a Animal I am a Cat

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