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CHAPTER 8 • ERROR AND EXCEPTION HANDLINGwww.it-ebooks.info}}/* Add the e-mail address to the database */function subscribeUser() {echo $this->email." added to the database!";}}// Assume that the e-mail address came from a subscription form$_POST['email'] = "someuser@example.com";/* Attempt to validate and add address to database. */if (isset($_POST['email'])) {$subscribe = new Subscribe();if($subscribe->validateEmail($_POST['email']))$subscribe->subscribeUser($_POST['email']);}?>You can see that it’s possible for two different exceptions to fire, one derived from the base class andone extended from the InvalidEmailException class.SPL’s ExceptionsIntroduced in Chapter 7, the Standard PHP Library (SPL) extends PHP by offering ready-made solutionsto commonplace tasks such as file access, iteration of various sorts, and the implementation of datastructures not natively supported by PHP such as stacks, queues, and heaps. Recognizing theimportance of exceptions, the SPL also offers access to 13 predefined exceptions. These extensions canbe classified as either being logic- or runtime-related, with X of the exception classes extendingLogicException and X extending RuntimeException, respectively. All of these classes ultimately extendthe native Exception class, meaning you’ll have access to methods such as getMessage() and getLine().Definitions of each exception follow:• BadFunctionCallException: The BadFunctionCallException class should be used tohandle scenarios where an undefined method is called, or if an incorrect numberof arguments are called in conjunction with a method.• BadMethodCallException: The BadMethodCallException class should be used tohandle scenarios where an undefined method is called, or if an incorrect numberof arguments are called in conjunction with a method.188