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<?php class A { public static $instance; public static function getInstance() { if (static::$instance === null) { static::$instance = new static(); } } } class B extends A { public static $instance; } echo get_class(A::getInstance()) . PHP_EOL; echo get_class(B::getInstance()) . PHP_EOL; echo get_class(A::getInstance()) . PHP_EOL;
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: get_class(): Argument #1 ($object) must be of type object, null given in /in/VIeOm:19 Stack trace: #0 {main} thrown in /in/VIeOm on line 19
Process exited with code 255.

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