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
	* @group error
	*/
	class PhutilProxyException extends Exception {

	private $previous;

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

	if (version_compare(PHP_VERSION, '5.3.0', '>=')) {
	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.
	return $this->previous;
	}

	}