note 81295 added to language.oop5.patterns
| From: | Mattlock at osu1 dot php dot net | Date: | Thu, 21 Feb 2008 16:16:07 +0000 |
| Subject: | note 81295 added to language.oop5.patterns | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-136356@lists.php.net to get a copy of this message | ||
This allows for singleton functionality via class extension, and does not use any shady functions
like eval.
<?php
interface ISingleton {
public static function GetInstance();
}
class Singleton implements ISingleton {
public static function GetInstance($class='Singleton') {
static $instances = array();
if (!is_string($class)) {
return null;
}
if ($instances[$class] === null) {
$instances[$class] = new $class;
}
return $instances[$class];
}
}
class Mars extends Singleton implements ISingleton {
public static function GetInstance() {
return Singleton::GetInstance(get_class());
}
}
class Neptune extends Singleton implements ISingleton {
public static function GetInstance() {
return Singleton::GetInstance(get_class());
}
}
$x = Mars::GetInstance();
echo '<pre>'.print_r($x,true).'</pre>';
$x = Neptune::GetInstance();
echo '<pre>'.print_r($x,true).'</pre>';
?>
----
Server IP: 209.41.74.194
Probable Submitter: 74.93.222.86
----
Manual Page -- http://www.php.net/manual/en/language.oop5.patterns.php
Edit -- https://master.php.net/note/edit/81295
Del: integrated -- https://master.php.net/note/delete/81295/integrated
Del: useless -- https://master.php.net/note/delete/81295/useless
Del: bad code -- https://master.php.net/note/delete/81295/bad+code
Del: spam -- https://master.php.net/note/delete/81295/spam
Del: non-english -- https://master.php.net/note/delete/81295/non-english
Del: in docs -- https://master.php.net/note/delete/81295/in+docs
Del: other reasons-- https://master.php.net/note/delete/81295
Reject -- https://master.php.net/note/reject/81295
Search -- https://master.php.net/manage/user-notes.php