note 108293 added to language.oop5.traits
| From: | ryan at derokorian dot com | Date: | Sun, 15 Apr 2012 02:03:17 +0000 |
| Subject: | note 108293 added to language.oop5.traits | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-187128@lists.php.net to get a copy of this message | ||
Simple singleton trait.
<?php
trait singleton {
/**
* private construct, generally defined by using class
*/
//private function __construct() {}
public static function getInstance() {
static $_instance = NULL;
$class = __CLASS__;
return $_instance ?: $_instance = new $class;
}
public function __clone() {
trigger_error('Cloning '.__CLASS__.' is not allowed.',E_USER_ERROR);
}
public function __wakeup() {
trigger_error('Unserializing '.__CLASS__.' is not allowed.',E_USER_ERROR);
}
}
/**
* Example Usage
*/
class foo {
use singleton;
private function __construct() {
$this->name = 'foo';
}
}
class bar {
use singleton;
private function __construct() {
$this->name = 'bar';
}
}
$foo = foo::getInstance();
echo $foo->name;
$bar = bar::getInstance();
echo $bar->name;
----
Server IP: 192.41.42.26
Probable Submitter: 66.61.77.245
----
Manual Page -- http://www.php.net/manual/en/language.oop5.traits.php
Edit -- https://master.php.net/note/edit/108293
Del: integrated -- https://master.php.net/note/delete/108293/integrated
Del: useless -- https://master.php.net/note/delete/108293/useless
Del: bad code -- https://master.php.net/note/delete/108293/bad+code
Del: spam -- https://master.php.net/note/delete/108293/spam
Del: non-english -- https://master.php.net/note/delete/108293/non-english
Del: in docs -- https://master.php.net/note/delete/108293/in+docs
Del: other reasons-- https://master.php.net/note/delete/108293
Reject -- https://master.php.net/note/reject/108293
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