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To validate the date string, you will add a new private method to the Calendar class called _validDate(). This method will accept the date string to be validated, then compare it to the validation pattern using preg_match(), which returns the number of matches found in the given string. Because this particular pattern will only match if the entire string conforms to the pattern, a valid date will return 1, while an invalid date will return 0. If the date is valid, the method will return TRUE; otherwise, it will return FALSE. Add this method to the Calendar class by inserting the following bold code into class.calendar.inc.php: < php class Calendar extends DB_Connect { private $_useDate; private $_m; private $_y; private $_daysInMonth; private $_startDay; public function __construct($dbo=NULL, $useDate=NULL) {...} public function buildCalendar() {...} public function displayEvent($id) {...} public function displayForm() {...} public function processForm() {...} public function confirmDelete($id) {...} /** * Validates a date string * * @param string $date the date string to validate * @return bool TRUE on success, FALSE on failure */ private function _validDate($date) { /* * Define a regex pattern to check the date format

Note Although these images are large in terms of dimensions, they are still very small in file size because

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As the name implies, this saves a new file to the storage system, replacing the file currently in place on the model instance. The arguments should be mostly self-explanatory, with being the name the new file should be saved as, and being the actual contents of the file to be written using that name. Of course, invalid characters in the filename or existing files with the same name could result in the filename being changed by the storage system. Such changes will be reflected in the filename that s stored on the model instance. The argument, however, merits further explanation. Because this saves a file that s related to a model instance, the new filename will be stored on that instance for future reference. However, it s not always beneficial to commit that change to the database immediately. By default, it does save the instance right away, but if is set to , this will be bypassed, allowing additional changes to take place before committing to the database. Take care when doing this, however. The file will already have been committed to the storage system, so failing to eventually save the instance with the new filename will result in a file with no references to it. Overriding this can provide a way to customize or record the filename that will be used, to change the default database commitment behavior, or perhaps most commonly, to retrieve information about the file s contents and update any cached information accordingly. The default object does this for the file size, and also updates its dimensions cache.

*/ $pattern = '/^(\d{4}(-\d{2}){2} (\d{2})(:\d{2}){2})$/'; /* * If a match is found, return TRUE. FALSE otherwise. */ return preg_match($pattern, $date)==1 TRUE : FALSE; } private function _loadEventData($id=NULL) {...} private function _createEventObj() {...} private function _loadEventById($id) {...} private function _adminGeneralOptions() {...} private function _adminEntryOptions($id) {...} } >

The outer container the div with the id of related has the larger right image applied, anchored to the top right, as demonstrated in the following CSS and in Figure 8-23: #related { background: #013433 url(example2/right.gif) no-repeat right top; }

delete(self, save=True)

Next, we apply the left image to the h2 heading, anchoring it to the top left. Because the left image is only a few pixels wide, it does not obscure the border previously applied the join is essentially seamless, as shown in Figure 8-24. #related h2 { margin: 0; padding: 10px; font-size: large; background: url(example2/left.gif) no-repeat left top; }

Also fairly self-explanatory, this deletes the file directly from the storage system, regardless of which storage system is being used. It also removes the filename from the model instance, so that it no longer references the file. The argument works just like the one from the method, determining whether the model instance is saved or not. Also like , if is provided, it s important to make sure the instance is in fact saved eventually. Otherwise, it will contain a reference to a file that has already been deleted. Perhaps worse yet, if another instance saves a file with the same name, the reference from the first instance will no longer be orphaned, but will in fact point to the wrong file entirely. Overriding this provides most of the same benefits as overriding , by being able to remove any cached information so it doesn t cause confusion if accessed later.

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