note 57692 added to language.oop5.patterns

Regarding the singleton pattern, you have to create the function for every singleton class you want to have, because settting a variable static will set the variable on all instances of the class, and second of all, by extending a singleton class, you are breaking rule No #1 of the singleton pattern. an instance of a given type may only excist ONCE, by extending the singleton class you have multiple instances of the singleton class, and by is sharing the static $instance variable. on thing could be done though, to make sure a programmer does not make any mistakes when creating singleton classes, an interface could be made, to make sure the singleton class is correctly defined. it could look something like this: <?php interface singleton { public static function getInstance(); } ?> however, this interface does NOT force the programmer to make the constructor private, and don't even bother to try, it would just result in a error. sorry to say it guys, there are no easy way around this one. not even a factory class can do the job for you since, the constructor must be private, to ensure that only one instance excists. ---- Manual Page -- http://www.php.net/manual/en/language.oop5.patterns.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+57692 Delete: added to the manual -- http://master.php.net/manage/user-notes.php?action=delete+57692&report=yes&reason=added+to+the+manual Delete: bad code -- http://master.php.net/manage/user-notes.php?action=delete+57692&report=yes&reason=bad+code Delete: spam -- http://master.php.net/manage/user-notes.php?action=delete+57692&report=yes&reason=spam Delete: useless -- http://master.php.net/manage/user-notes.php?action=delete+57692&report=yes&reason=useless Delete: non-english -- http://master.php.net/manage/user-notes.php?action=delete+57692&report=yes&reason=non-english Delete: already in docs -- http://master.php.net/manage/user-notes.php?action=delete+57692&report=yes&reason=already+in+docs Delete: other reasons -- http://master.php.net/manage/user-notes.php?action=delete+57692&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+57692&report=yes Search -- http://master.php.net/manage/user-notes.php