@ 2013-10-20T13:59:30Z <?php
abstract 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;
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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 , 8.0.0 - 8.0.30 , 8.1.0 - 8.1.28 , 8.2.0 - 8.2.18 , 8.3.0 - 8.3.6 Fatal error: Uncaught Error: Cannot instantiate abstract class Singleton in /in/KL7T2:23
Stack trace:
#0 /in/KL7T2(34): Singleton::getInstance()
#1 {main}
thrown in /in/KL7T2 on line 23
Process exited with code 255 . Output for 5.0.0 - 5.0.5 , 5.1.0 - 5.1.6 , 5.2.0 - 5.2.17 , 5.3.0 - 5.3.29 , 5.4.0 - 5.4.45 , 5.5.24 - 5.5.35 , 5.6.7 - 5.6.28 Fatal error: Cannot instantiate abstract class Singleton in /in/KL7T2 on line 23
Process exited with code 255 . Output for 4.4.2 - 4.4.9 Parse error: syntax error, unexpected T_CLASS in /in/KL7T2 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/KL7T2 on line 3
Process exited with code 255 . Output for 4.3.2 - 4.3.4 Parse error: parse error in /in/KL7T2 on line 3
Process exited with code 255 . preferences:dark mode live preview
182.87 ms | 401 KiB | 315 Q