(PHP >= 5.4.0)
ReflectionClass::isCloneable — Returns whether this class is cloneable
Returns whether this class is cloneable.
This function has no parameters.
   Returns TRUE if the class is cloneable, FALSE otherwise.
  
Example #1 Basic usage of ReflectionClass::isCloneable()
<?php
class NotCloneable {
    public $var1;
    
    private function __clone() {
    }
}
class Cloneable {
    public $var1;
}
$notCloneable = new ReflectionClass('NotCloneable');
$cloneable = new ReflectionClass('Cloneable');
var_dump($notCloneable->isCloneable());
var_dump($cloneable->isCloneable());
?>
The above example will output:
bool(false) bool(true)