user_defined_exception.php

《PHP和MySQL Web开发》(第三版) Source

<?php

class myException extends Exception
{
  function __toString()
  {
       return '<table border><tr><td><strong>Exception '. $this->getCode()
              . '</strong>: '. $this->getMessage().'<br />'.' in '
              . $this->getFile(). ' on line '. $this->getLine()
              . '</td></tr></table><br />';
   }
}

try 
{
  throw new myException('A terrible error has occurred', 42);
}
catch (myException $m)
{
   echo $m;
}

?>