var_dump - 如何从dump PHP中获取特定值

I know there is alot of information available in regards to PHP - var_dump my question is if I need to pick the particular information from the dump I am receiving from the API which is returning different array object....for example the below dump I need the information of realm under characterData Array how can I pick the that information and stored in String variable. Brief example of php code to explain my question will be highly appreciated...I know there is alot of information available i