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<?php class Example { static $function; static function method() { ${self::$function}(); } } function callback() {} Example::$function = 'callback'; Example::method();
Output for git.master_jit, git.master, rfc.property-hooks
Warning: Undefined variable $callback in /in/C9MmD on line 9 Fatal error: Uncaught Error: Value of type null is not callable in /in/C9MmD:9 Stack trace: #0 /in/C9MmD(16): Example::method() #1 {main} thrown in /in/C9MmD on line 9
Process exited with code 255.

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