- Use method_exists() instead of is_callable() to detect whether a   certain method is implemented - is_callable will also check that __call will   catch such a call, but we actually want to see a method implemented # Forward-compatible fix for 5_8 branch
- Use method_exists() instead of is_callable() to detect whether a
  certain method is implemented - is_callable will also check that __call will
  catch such a call, but we actually want to see a method implemented
# Forward-compatible fix for 5_8 branch

git-svn-id: 526f3b90ad6d9b1dfe840af828070ca3d99521ac@13826 d2cacbed-c0f6-0310-851a-9dad52fc623a

johannes85/core