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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());

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