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<?php class A { public $v; private static $_cli; private function __construct() { } public static function getCli() { if (!self::$_cli instanceof self) { self::$_cli = new self(); } return self::$_cli; } // override __clone() to private private function __clone() { } } $c1 = A::getCli(); $c1->v = 1; $c2 = $c1; $c2->v = 2; $c3 = clone $c1; $c3->v = 3; var_dump($c1->v, $c2->v, $c3->v);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Call to private A::__clone() from global scope in /in/QEWFA:27 Stack trace: #0 {main} thrown in /in/QEWFA on line 27
Process exited with code 255.

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