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<?php abstract class Singleton { protected static $instance = null; /** * make contrutor not public */ protected function __construct() { } /** * @return static */ public static function getInstance() { if (static::$instance === null) { static::$instance = new static(); } return static::$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 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
xy Fatal error: Uncaught Error: Call to protected Singleton::__construct() from global scope in /in/BrfO4:42 Stack trace: #0 {main} thrown in /in/BrfO4 on line 42
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33
xy Fatal error: Uncaught Error: Call to protected Singleton::__construct() from invalid context in /in/BrfO4:42 Stack trace: #0 {main} thrown in /in/BrfO4 on line 42
Process exited with code 255.
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.35, 5.6.0 - 5.6.28
xy Fatal error: Call to protected Singleton::__construct() from invalid context in /in/BrfO4 on line 42
Process exited with code 255.
Output for 5.2.3 - 5.2.17
Parse error: syntax error, unexpected T_STATIC in /in/BrfO4 on line 22
Process exited with code 255.
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.2
<br /> <b>Parse error</b>: syntax error, unexpected T_STATIC in <b>/in/BrfO4</b> on line <b>22</b><br />
Process exited with code 255.
Output for 5.0.0 - 5.0.5
<br /> <b>Parse error</b>: parse error, unexpected T_STATIC in <b>/in/BrfO4</b> on line <b>22</b><br />
Process exited with code 255.
Output for 4.4.2 - 4.4.9
<br /> <b>Parse error</b>: syntax error, unexpected T_CLASS in <b>/in/BrfO4</b> on line <b>3</b><br />
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
<br /> <b>Parse error</b>: parse error, unexpected T_CLASS in <b>/in/BrfO4</b> on line <b>3</b><br />
Process exited with code 255.
Output for 4.3.2 - 4.3.4
<br /> <b>Parse error</b>: parse error in <b>/in/BrfO4</b> on line <b>3</b><br />
Process exited with code 255.
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