The Problem here is that the Template Files get processed before the wp_footer action, so your constant is not defined at that stage.
Just to be sure, try hooking your constructor of the class to an action that is called earlier, I don’t really know how early you need it, but try init. You could also construct your class when the Plugin is loaded, then you should be on the safe side.
Related Posts:
- Using the ABSPATH constant – What files need to be loaded before use?
- How to use defined in class file with namespace
- ABSPATH in Windows
- What mechanism does WordPress use to keep constants from being redefined?
- difference of each codes for wordpress
- Checking for existence of constants before defining them
- Constant defined in header.php not visible in functions.php
- Insert functions-defined constant into get_tags code
- Notice: Use of undefined constant – assumed ‘ ‘ [closed]
- How do I create a constant in Python?
- What is meant with “const” at end of function declaration? [duplicate]
- What is the best way to implement constants in Java?
- Difference between `constexpr` and `const`
- What is the difference between char s[] and char *s?
- What is the difference between const int*, const int * const, and int const *?
- What is the difference between const int*, const int * const, and int const *?
- Difference between const reference and normal parameter
- invalid use of non-static member function
- How to convert a std::string to const char* or char*
- What is the difference between a static and const variable?
- Why Is `Export Default Const` invalid?
- Difference between char* and const char*?
- How can I convert const char* to string and then back to char*?
- Why is there no Constant feature in Java?
- How to create a dynamically-allocated array of const objects, but have values assigned to them?
- What is the difference between const and readonly in C#?
- C++: Expression must have a constant value when declaring array inside function
- What does __FILE__ mean?
- Constant pointer vs Pointer to constant
- What is the difference between const_iterator and non-const iterator in the C++ STL?
- Class constants in python
- Why does JSHint throw a warning if I am using const?
- What is a class constant?
- How to sort with a lambda?
- What does the PHP error message “Notice: Use of undefined constant” mean?
- non-member function cannot have cv-qualifier
- Where to declare/define class scope constants in C++?
- Use of ‘const’ for function parameters
- What should I use instead of WP_CONTENT_DIR and WP_PLUGIN_DIR?
- Turn Off Automatic Trash Deletion?
- Understanding SHORTINIT with WordPress 5
- BLOG_ID_CURRENT_SITE vs. SITE_ID_CURRENT_SITE in WordPress Multisite?
- Syntax of FS_CHMOD_DIR and FS_CHMOD_FILE
- get plugin directory url
- Synchronizing Two WordPress Sites Content
- Can’t we use strings defined as PHP constants if we want to translate them in a plugin?
- Use theme constants in plugin?
- Are there any security issues with setting the WP_INSTALLING constant to true?
- Best Constant to use to check if WordPress is running
- wp_enqueue_script & constants?
- Accessing site’s root from themes folder
- Define a wordpress constant through plugin functions?
- Calling directories to load in wordpress
- DISALLOW_FILE_EDIT constant being ignored
- How can I change the language of automated Mails?
- URL for images folder on Multisite
- How to define constant before plugin [duplicate]
- is there a benefit in using a constant over get_stylesheet_directory_uri?
- Autosave interval remains default despite wp-config.php defines
- Update the value of a constant
- How can I append blog_id to … echo [functions-defined-constant]?
- why would ABSPATH not get defined
- Constant for ‘barebones’ update of WordPress
- Get WP Install Directory
- Get variable value based on string constant
- Many Single Sites, One Plugin directory – adjust plugins_url()
- Is it better to use a constant or apply_filter?
- WP_HOME (and WP_URL) are undefined
- Cannot enable WordPress Network – ‘MULTISITE’ already defined and false
- Child theme functions.php file change database entries
- Where and how to define variables for URLs etc
- Notice: Use of undefined constant Redux_TEXT_DOMAIN – assumed ‘Redux_TEXT_DOMAIN’
- Notice: Use of undefined constant – assumed ‘ ‘
- Making Site A Use Site B’s wp-content Folder
- Define constant for one plugin in mu-plugin
- Override plugin constant using a theme
- Use of undefined constant issue
- Should we escape the values of constants?