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<?php function setPrevious(Throwable $e, Throwable $previous): Throwable { $reflection = new ReflectionClass($e); $prop = $reflection->getProperty('previous'); $prop->setAccessible(true); $prop->setValue($e, $previous); return $e; } class SimpleException extends Exception { public function __construct($message) { parent::__construct($message); } } $a = new SimpleException('A'); $b = new SimpleException('B'); $c = new SimpleException('C'); setPrevious($a, $b); setPrevious($a, $c); $e = $a; do { var_dump($e->getMessage()); } while ($e = $e->getPrevious());
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught ReflectionException: Property SimpleException::$previous does not exist in /in/0ct5l:6 Stack trace: #0 /in/0ct5l(6): ReflectionClass->getProperty('previous') #1 /in/0ct5l(24): setPrevious(Object(SimpleException), Object(SimpleException)) #2 {main} thrown in /in/0ct5l on line 6
Process exited with code 255.

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