(PHP 7, PHP 8)
Throwable::getPrevious — Returns the previous Throwable
abstract public Throwable::getPrevious ( ) : Throwable
Returns any previous Throwable (for example, one provided as the third parameter to Exception::__construct()).
This function has no parameters.
Returns the previous Throwable if available, or null otherwise.
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https://www.php.net/manual/en/throwable.getprevious.php