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run code in 200+ php & hhvm versions
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<?php class Singleton { private static $instanciated = false; public function __construct() { if (self::$instanciated === true) { throw new RuntimeException('Could not instanciate class'); } self::$instanciated = true; echo "new instance\n"; } private $var; public function get(): int { return $this->var; } public function set(int $value) { $this->var = $value; } } class Factory { private $instance = null; public function getInstance() { echo "getInstance()\n"; if ($this->instance === null) { $this->instance = new Singleton(); } return $this->instance; } } $factory = new Factory(); $o = $factory->getInstance(); $o->set(5); $factory2 = new Factory(); try { $o2 = $factory->getInstance(); echo "instance returned\n"; var_dump($o2->get()); } catch (Throwable $e) { echo "Non: ", $e->getMessage(), "\n"; }
based on l3N2X
Output for 7.0.0 - 7.2.0
getInstance() new instance getInstance() instance returned int(5)
Output for 5.3.19 - 5.6.28
Parse error: syntax error, unexpected ':', expecting ';' or '{' in /in/2f70V on line 17
Process exited with code 255.