Differential D20980 Diff 49996 src/error/PhutilProxyException.php

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				<?php

				/**
				* Prior to PHP 5.3, PHP does not support nested exceptions; this class provides
				* limited support for nested exceptions. Use methods on
				* @{class:PhutilErrorHandler} to unnest exceptions in a forward-compatible way.
				*
				* @concrete-extensible
				*/
				class PhutilProxyException extends Exception {

				private $previousException;

				public function __construct($message, $previous, $code = 0) {
				$this->previousException = $previous;

				// This may be an "Exception" or a "Throwable". The "__construct()" method
				// for the Exception is documented as taking an Exception, not a Throwable.
				// Although passing a Throwable appears to work in PHP 7.3, don't risk it.
				$is_exception = ($previous instanceof Exception);

				if (version_compare(PHP_VERSION, '5.3.0', '>=') && $is_exception) {
				parent::__construct($message, $code, $previous);
				} else {
				parent::__construct($message, $code);
				}
				}

				public function getPreviousException() {
				// NOTE: This can not be named "getPrevious()" because that method is final
				// after PHP 5.3. Similarly, the property can not be named "previous"
				// because HPHP declares a property with the same name and "protected"
				// visibility.
				return $this->previousException;
				}

				}