Php not defined

- Php not defined variable
- Php defined not working
- Php if not defined
- Php if not defined constant
- Php if not defined function
- Php route not defined
- Php stderr not defined
- Php artisan test not defined
- Php command is not defined
- Php $_server 'http_host' not defined
- Php artisan about is not defined
- Php artisan command is not defined
- Php uncaught referenceerror $ is not defined
- Php must not be defined
- Php function not defined