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<?php abstract class almostSingleton { final protected function __construct() { echo 'Built ' . get_class($this) . PHP_EOL; } } class GoodTwin extends almostSingleton { } class EvilTwin extends almostSingleton { public static function static_getGoodTwin() { return new GoodTwin(); } public function getGoodTwin() { return new GoodTwin(); } } $gotcha = EvilTwin::static_getGoodTwin(); $et = new EvilTwin(); $nope = $et->getGoodTwin();
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
Built GoodTwin Fatal error: Uncaught Error: Call to protected almostSingleton::__construct() from global scope in /in/glRkc:22 Stack trace: #0 {main} thrown in /in/glRkc on line 22
Process exited with code 255.
Output for 7.0.0 - 7.0.11, 7.2.29 - 7.2.33, 7.3.16 - 7.3.33, 7.4.3 - 7.4.33
Built GoodTwin Fatal error: Uncaught Error: Call to protected almostSingleton::__construct() from invalid context in /in/glRkc:22 Stack trace: #0 {main} thrown in /in/glRkc on line 22
Process exited with code 255.
Output for 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.26
Built GoodTwin Fatal error: Call to protected almostSingleton::__construct() from invalid context in /in/glRkc on line 22
Process exited with code 255.
Output for 5.0.2 - 5.0.5, 5.1.0 - 5.1.6
Built GoodTwin Fatal error: Call to protected almostSingleton::__construct() from context '' in /in/glRkc on line 22
Process exited with code 255.
Output for 5.0.0 - 5.0.1
Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/glRkc on line 5 Built GoodTwinPHP_EOL Fatal error: Call to protected almostSingleton::__construct() from context '' in /in/glRkc on line 22
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_CLASS in /in/glRkc on line 3
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
Parse error: parse error, unexpected T_CLASS in /in/glRkc on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/glRkc on line 3
Process exited with code 255.

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