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<?php

/**
 * Swift Mailer PHP4 Exception hackaround.
 * Please read the LICENSE file
 * @author Chris Corbyn <chris@w3style.co.uk>
 * @package Swift
 * @license GNU Lesser General Public License
 */

/**
 * Swift Exception handling object for PHP4
 * Triggers and/or catches errors
 * @package Swift
 * @author Chris Corbyn <chris@w3style.co.uk>
 */
class Swift_Errors
{
 /**
 * Caught errors
 * @var array,Swift_Error
 */
 var $errors = array();
 /**
 * If an error has been thrown previously and not caught (hack)
 * @var boolean
 */
 var $halt = false;
 /**
 * Errors we're expecting, so don't trigger them
 * @var array
 */
 var $try = array();
 
 /**
 * Get an instance of this class as a singleton - needed internally
 * @return Swift_Errors
 */
 function &getInstance()
 {
 static $instance = null;
 if (!$instance) $instance = array(new Swift_Errors());
 return $instance[0];
 }
 /**
 * Check if things are supposed to have stopped processing because of an
 * uncaught excpetion
 * @return boolean
 */
 function halted()
 {
 $me =& Swift_Errors::getInstance();
 return $me->halt;
 }
 /**
 * Reset everything logged so far
 */
 function reset()
 {
 $me =& Swift_Errors::getInstance();
 $me->errors = array();
 $me->halt = false;
 $me->try = array();
 }
 /**
 * Throw a new exception - it will either be caught or triggered
 * @param Swift_Exception
 */
 function trigger(&$e)
 {
 $me =& Swift_Errors::getInstance();
 $me->errors[] =& $e;
 $me->halt = true;
 foreach (array_reverse(array_keys($me->try)) as $type)
 {
 if (is_a($e, $type))
 {
 foreach (array_reverse(array_keys($me->try[$type])) as $i)
 {
 $me->try[$type][$i] = $e;
 unset($me->try[$type][$i]);
 $me->halt = false;
 return;
 }
 }
 }
 //If here, then it wasn't caught
 $me->dumpError($e);
 }
 /**
 * Dump the error if it was not caught
 * @param Swift_Exception
 */
 function dumpError(&$e)
 {
 $output = " Uncaught Error of type [" . get_class($e) . "] with message [" . $e->getMessage() . "]";
 $output .= " " . $e->getBacktraceDump() . " ";
 trigger_error($output, E_USER_ERROR);
 }
 /**
 * Tell the error handler we're expecting an error of type $type and assign it to $e
 * @param &$e
 * @param string The type of expection - optional
 */
 function expect(&$e, $type="Swift_Exception")
 {
 $me =& Swift_Errors::getInstance();
 $e = null;
 $me->try[$type][] =& $e;
 }
 /**
 * Clear anything that may have been expected matching $type
 * @param string The type
 */
 function clear($type)
 {
 $me =& Swift_Errors::getInstance();
 if (isset($me->try[$type]))
 {
 foreach (array_reverse(array_keys($me->try[$type])) as $i)
 {
 unset($me->try[$type][$i]);
 break;
 }
 }
 }
 /**
 * The last error message as a string
 * @return string
 */
 function getLast()
 {
 $me =& Swift_Errors::getInstance();
 if (count($me->errors))
 {
 $last =& $me->errors[(count($me->errors)-1)];
 return $last->getMessage();
 }
 }
 /**
 * Get all logged errors as an array
 * @return array,Swift_Exception
 */
 function &getAll()
 {
 return $this->errors;
 }
}

Editing: Errors.php

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