What mechanism does WordPress use to keep constants from being redefined?

What mechanism does WordPress use to keep constants from being redefined?

None. Constants are not a WordPress feature, they’re a part of the PHP programming language.

Someone replied, “If the original coders don’t know that you can’t redefine a constant than why would you even trust any of their other code?”

I think this is them suggesting that if the authors don’t know that you cannot redefine a constant, then they might not be very good at PHP

That made me wonder, what mechanism in WordPress keeps themes/plugins/etc from redefining constants? I’m guessing that it has to do with the order in which code loads.

Once a constant is defined, it can’t be changed. PHP enforces this, otherwise constants would just be fancy variables that can change on a whim.

Generally, it’s considered poor practice to define those constants in plugins and themes. They’re intended for wp-config.php and should be set by the user. I would treat any plugin or theme that defines WP constants with great suspicion and skepticism.

Related Posts:

  1. Using the ABSPATH constant – What files need to be loaded before use?
  2. How to use defined in class file with namespace
  3. ABSPATH in Windows
  4. difference of each codes for wordpress
  5. Checking for existence of constants before defining them
  6. Constant defined in header.php not visible in functions.php
  7. Can’t Access Constant from within Included File
  8. Insert functions-defined constant into get_tags code
  9. Notice: Use of undefined constant – assumed ‘ ‘ [closed]
  10. How do I create a constant in Python?
  11. What is meant with “const” at end of function declaration? [duplicate]
  12. What is the best way to implement constants in Java?
  13. Difference between `constexpr` and `const`
  14. What is the difference between char s[] and char *s?
  15. What is the difference between const int*, const int * const, and int const *?
  16. What is the difference between const int*, const int * const, and int const *?
  17. Difference between const reference and normal parameter
  18. invalid use of non-static member function
  19. How to convert a std::string to const char* or char*
  20. What is the difference between a static and const variable?
  21. Why Is `Export Default Const` invalid?
  22. Difference between char* and const char*?
  23. How can I convert const char* to string and then back to char*?
  24. Why is there no Constant feature in Java?
  25. How to create a dynamically-allocated array of const objects, but have values assigned to them?
  26. What is the difference between const and readonly in C#?
  27. C++: Expression must have a constant value when declaring array inside function
  28. What does __FILE__ mean?
  29. Constant pointer vs Pointer to constant
  30. What is the difference between const_iterator and non-const iterator in the C++ STL?
  31. Class constants in python
  32. Why does JSHint throw a warning if I am using const?
  33. What is a class constant?
  34. How to sort with a lambda?
  35. What does the PHP error message “Notice: Use of undefined constant” mean?
  36. non-member function cannot have cv-qualifier
  37. Where to declare/define class scope constants in C++?
  38. Use of ‘const’ for function parameters
  39. What should I use instead of WP_CONTENT_DIR and WP_PLUGIN_DIR?
  40. Turn Off Automatic Trash Deletion?
  41. Understanding SHORTINIT with WordPress 5
  42. BLOG_ID_CURRENT_SITE vs. SITE_ID_CURRENT_SITE in WordPress Multisite?
  43. Syntax of FS_CHMOD_DIR and FS_CHMOD_FILE
  44. get plugin directory url
  45. Synchronizing Two WordPress Sites Content
  46. Can’t we use strings defined as PHP constants if we want to translate them in a plugin?
  47. Use theme constants in plugin?
  48. Are there any security issues with setting the WP_INSTALLING constant to true?
  49. Best Constant to use to check if WordPress is running
  50. wp_enqueue_script & constants?
  51. Accessing site’s root from themes folder
  52. Define a wordpress constant through plugin functions?
  53. Calling directories to load in wordpress
  54. DISALLOW_FILE_EDIT constant being ignored
  55. How can I change the language of automated Mails?
  56. URL for images folder on Multisite
  57. How to define constant before plugin [duplicate]
  58. is there a benefit in using a constant over get_stylesheet_directory_uri?
  59. Autosave interval remains default despite wp-config.php defines
  60. Update the value of a constant
  61. How can I append blog_id to … echo [functions-defined-constant]?
  62. why would ABSPATH not get defined
  63. Constant for ‘barebones’ update of WordPress
  64. Get WP Install Directory
  65. Get variable value based on string constant
  66. Many Single Sites, One Plugin directory – adjust plugins_url()
  67. Is it better to use a constant or apply_filter?
  68. WP_HOME (and WP_URL) are undefined
  69. Cannot enable WordPress Network – ‘MULTISITE’ already defined and false
  70. Child theme functions.php file change database entries
  71. Where and how to define variables for URLs etc
  72. Notice: Use of undefined constant Redux_TEXT_DOMAIN – assumed ‘Redux_TEXT_DOMAIN’
  73. Notice: Use of undefined constant – assumed ‘ ‘
  74. Making Site A Use Site B’s wp-content Folder
  75. Define constant for one plugin in mu-plugin
  76. Override plugin constant using a theme
  77. Use of undefined constant issue
  78. Should we escape the values of constants?
Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)