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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 = $e->getPrevious());
Output for 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.22, 8.5.0 - 8.5.7
Deprecated: Creation of dynamic property SimpleException::$previous is deprecated in /in/4scuq on line 6 string(1) "A"
Output for 7.1.26 - 7.1.33, 7.2.17 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34
string(1) "A"
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81.13 ms | 1430 KiB | 4 Q