Php if not set
- Php if not set variable
- Php default value if not set
- Php return null if not set
- Php set if not null
- Php set value if not null
- Php set cookie if not exist
- Php check if not set
- Php default if not set
- Php if post not set
- Php if session is not set
- Php initialize variable if not set
- Php if session variable is not set
- Php set variable if not null
- Php check if variable is not set
- Php if set and not empty