Description:
------------
The isDefaultValueAvailable() of ReflectionParameter object doesn't return true for any parameter if the next parameter in collection has no default value. To regenerate the bug, execute the following script



Reproduce code:
---------------
<?
class TestClass
{
	public function __construct($a , $b=6 , $c = "hh", $d, $e=76)
	{

	}
}

$class = new ReflectionClass("TestClass");
$method= $class->getMethod("__construct");
$parameter = $method->getParameters();

foreach ($parameter as $param)
{
	if ($param->isDefaultValueAvailable())
	{
		if (is_null($param->getDefaultValue()))
		echo $param->getName()." : null \n";
		else
		echo $param->getName()." : ".$param->getDefaultValue()."\n";
	}
}
?>




Expected result:
----------------
b : 6
c : hh
e : 76

Actual result:
--------------
e : 76