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<?php class Singleton { protected static $instance = null; /** * make contrutor not public */ protected function __construct() { } /** * @return static */ public static function getInstance() { if (self::$instance === null) { self::$instance = new self(); } return self::$instance; } } class ExampleSingleton extends Singleton { public $name = 'x'; } $s = ExampleSingleton::getInstance(); echo $s->name; $s->name = 'y'; echo ExampleSingleton::getInstance()->name; $s2 = new ExampleSingleton(); echo $s2->name;
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined property: Singleton::$name in /in/K0CkO on line 36 Deprecated: Creation of dynamic property Singleton::$name is deprecated in /in/K0CkO on line 38 y Fatal error: Uncaught Error: Call to protected Singleton::__construct() from global scope in /in/K0CkO:42 Stack trace: #0 {main} thrown in /in/K0CkO on line 42
Process exited with code 255.

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