Php check if is defined
- Php check if constant is defined
- Php check if variable is defined
- Php check if function is defined
- Php check if property is defined
- Php check if constant is defined in class
- Php check if class is defined
- Php check if method is defined
- Php check if defined constant exists
- Php check if array key is defined
- Php check if value defined
- Php 8 check if constant is defined
- Php check if var is defined
- Php check if define is defined
- Php check if constant defined
- Php check if index is defined