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<?php function setPrevious(Throwable $e, Throwable $previous): Throwable { return (function () use ($e, $previous) { $e->previous = $previous; return $e; })->call($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 = $e->getPrevious());
Output for git.master, git.master_jit, rfc.property-hooks
Deprecated: Creation of dynamic property SimpleException::$previous is deprecated in /in/4scuq on line 6 string(1) "A"

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