Now you need to upload the wp-includesand wp-admin directories. Error: Use of undefined constant 'US' - assumed ''US'' (this will Please go to Appearance > Menus and check the Logic field for your menu items, see if any of them have US constant in them. PHP notice "WP_CONTENT_DIR undefined" occurs when creating ... - WordPress [SOLVED] Use of undefined constant - PHP Coding Help - PHP Freaks PHP assumes that a "name" without quotes (to identify it as a string) or a $ (to identify it as a variable) is a constant. : Now I'm trying to add more constants: I just keep getting these errors for every constant I define: I'm I missing something? Use of undefined constant ABSPATH - assumed 'ABSPATH' as of WP5.9 A better solution would be for the install script to define the new definitions at a best-guess i think. Warning: Use of undefined constant reply_text - assumed 'reply_text' Enviroment: Windows 8.1 XAMPP Wordpress v4.11 Redux v3.50 Notice: Use of undefined constant AUTH_KEY . WordPressサイトをPHPバージョン変更後に「Use of undefined constant」エラーが発生した場合の対応方法|きむおばブログ One example, though it's occurring in multiple folders, creating 'error_log' files in each directory. Share. Notice: Use of undefined constant SCRIPT_DEBUG | WordPress Q&A If for any reason this automatic file creation doesn't work, don't worry. This is a known bug This will cause the following notice: Notice: Use of undefined constant name - assumed 'email'. Hi There! Warning: Use of undefined constant reply_text - assumed 'reply_text' . Use of undefined constant エラーの原因と修正案 - ONE NOTES