What does the PHP error message “Notice: Use of undefined constant” mean?

by

department is meant to be a string (to be used here as array key). Strings in PHP must be enclosed in quotes. In the days of the long past PHP was lax about using quotes for single-word strings but these days are long gone.

Therefore, it must be 'department' or "department".

The same goes for the other errors as well.

As is, it was looking for constants called department, name, email, message, etc. When it doesn’t find such a constant, PHP (bizarrely) interprets it as a string (‘department’, etc) but warns you about that. Obviously, this can easily break if you do defined such a constant later (though it’s bad style to have lower-case constants).

More Related Contents:

  1. PHP | define() vs. const
  2. PHP Constants Containing Arrays?
  3. undefined offset PHP error
  4. Can I get CONST’s defined on a PHP class?
  5. How do I turn off PHP Notices?
  6. Accessing a class constant using a simple variable which contains the name of the constant
  7. Dynamic constant name in PHP
  8. php $_GET and undefined index
  9. Can I use string concatenation to define a class CONST in PHP?
  10. Redefining constants in PHP
  11. Include constant in string without concatenating
  12. Undefined variable problem with PHP function
  13. PHP 5: const vs static
  14. Notice: Undefined index: HTTP_REFERER
  15. PHP Undefined index error $_FILES?
  16. Which is faster? Constants, Variables or Variable Arrays
  17. quoting constants in php: “this is a MY_CONSTANT”
  18. Undefined index error PHP
  19. Warning: foreach staement
  20. PHP preg_match with working regex [duplicate]
  21. How to pad single-digit numbers with a leading 0
  22. PDO prepared statement – what are colons in parameter names used for?
  23. Utility of HTTP header “Content-Type: application/force-download” for mobile?
  24. PHP: Adding months to a date, while not exceeding the last day of the month
  25. Is it possible to type hint more than one type?
  26. How do you make strings “XML safe”?
  27. Unsetting array values in a foreach loop [duplicate]
  28. PHP exec $PATH variable missing elements
  29. Find out the error_log’s path
  30. How to return custom error message from controller method validation

Leave a Comment