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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 $s2->name;
Output for 7.0.0 - 7.1.0
Notice: Undefined property: Singleton::$name in /in/K0CkO on line 36 y Fatal error: Uncaught Error: Call to protected Singleton::__construct() from invalid context in /in/K0CkO:42 Stack trace: #0 {main} thrown in /in/K0CkO on line 42
Process exited with code 255.
Output for 5.2.6 - 5.6.28
Notice: Undefined property: Singleton::$name in /in/K0CkO on line 36 y Fatal error: Call to protected Singleton::__construct() from invalid context in /in/K0CkO on line 42
Process exited with code 255.
Output for 5.2.0 - 5.2.5
Notice: Undefined property: Singleton::$name in /in/K0CkO on line 36 y Fatal error: Call to protected Singleton::__construct() from invalid context in /in/K0CkO on line 42
Process exited with code 255.
Output for 5.0.0 - 5.1.6
Notice: Undefined property: Singleton::$name in /in/K0CkO on line 36 y Fatal error: Call to protected Singleton::__construct() from context '' in /in/K0CkO on line 42
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/K0CkO on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/K0CkO on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/K0CkO on line 5
Process exited with code 255.