对象复制和PHP中的克隆

Consider the following:

考虑以下:

$object1 = new stdClass();
$object2 = $object1;
$object3 = clone $object1;

$object1->content = 'Ciao';

var_dump($object1);
 // Outputs object(stdClass)#1 (1) { ["content"]=> string(4) "Ciao" }
var_dump($object2);
 // Outputs object(stdClass)#1 (1) { ["content"]=> string(4) "Ciao" }
var_dump($object3);
 // Outputs object(stdClass)#2 (0) { }
$object1 = ne