Replace include_once with require_once in twenty twenty one theme #4302
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According to the WordPress PHP coding standards, it is recommended to use require[_once] instead of include[_once] for unconditional includes. However, in two files of the twenty twenty one theme, I have found include_once used unconditionally.
To improve consistency and ensure better security and stability of the code, I propose replacing include_once with require_once in these two files.
This change will ensure that if the file cannot be found, a Fatal Error will be thrown, preventing any potential security leaks or other issues that may arise due to the file not being loaded properly.
I have created a pull request for these changes, and I kindly request a review from the WordPress core team.
Trac ticket: https://core.trac.wordpress.org/ticket/57839
This Pull Request is for code review only. Please keep all other discussion in the Trac ticket. Do not merge this Pull Request. See GitHub Pull Requests for Code Review in the Core Handbook for more details.