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<?php abstract class T { static $instanses; final private function __construct(){ } public static function getInstance() { if (!isset(static::$instanses)) { static::$instanses = new $this; } return static::$instanses; } } class A extends T { } $t = A::getInstance(); var_dump($t); ?>
Output for 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
Fatal error: Uncaught Error: Using $this when not in object context in /in/MFJ3F:14 Stack trace: #0 /in/MFJ3F(25): T::getInstance() #1 {main} thrown in /in/MFJ3F on line 14
Process exited with code 255.
Output for 7.0.0 - 7.0.20
Notice: Undefined variable: this in /in/MFJ3F on line 14 Fatal error: Uncaught Error: Class name must be a valid object or a string in /in/MFJ3F:14 Stack trace: #0 /in/MFJ3F(25): T::getInstance() #1 {main} thrown in /in/MFJ3F on line 14
Process exited with code 255.
Output for 5.4.2 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28
Notice: Undefined variable: this in /in/MFJ3F on line 14 Fatal error: Class name must be a valid object or a string in /in/MFJ3F on line 14
Process exited with code 255.
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