Description:
------------
(Version is actually 5.0.5 but it doesn't give me that option...) Using latest runkit.

runkit_method_add changes the case of its class argument to all lowercase, even though it is not documented as being passed by reference.

Somewhat bizarely, if you assign the same string to a different variable (normal assignment, not assignment by reference), it changes both strings!!!!!

Reproduce code:
---------------
<?
class TestClass {
}

$TARGET1 = "TestClass";
$TARGET2 = $TARGET1;
echo "TARGET1=$TARGET1,TARGET2=$TARGET2\n";
runkit_method_add($TARGET1,"foo",'$a','echo "Hello:$a\n";');
echo "TARGET1=$TARGET1,TARGET2=$TARGET2\n";


Expected result:
----------------
TARGET1=TestClass,TARGET2=TestClass
TARGET1=TestClass,TARGET2=TestClass

Actual result:
--------------
TARGET1=TestClass,TARGET2=TestClass
TARGET1=testclass,TARGET2=testclass