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@ 2015-11-02T20:49:17Z

<?php

class Factory {
    
    private $instance = null;
    
    public function getInstance()
    {
        if ($this->instance === null) {
            $this->instance = new class() {
                private static $instanciated = false;
                
                public function __construct()
                {
                    if (self::$instanciated) {
                        throw new RuntimeException('Could not instanciate class');
                    }
                    self::$instanciated = true;
                }
                
                private $var;
                
                public function get(): int {
                    return $this->var;
                }
                
                public function set(int $value) {
                    $this->var = $value;
                }
            };
        }
        return $this->instance;
    }
}

$factory = new Factory();
$o = $factory->getInstance();
$o->set(5);

$factory2 = new Factory();
$o2 = $factory->getInstance();
var_dump($o2->get());

Output for 7.0.0 - 7.0.33, 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 - 8.3.6: int(5)
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38: Parse error: syntax error, unexpected 'class' (T_CLASS) in /in/HgOW9 on line 10
Process exited with code 255.

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