Problem:
After updating the PHP version on the live site, the client encountered a fatal error related to an unknown format specifier in the sprintf function. This error was linked to the LearnDash plugin translations managed by WPML String Translation.
Solution:
We identified that the error was due to incorrect usage of the PHP sprintf function in the translations of the LearnDash plugin. Specifically, many translations were missing the 's' at the end of the placeholders. For example, '%1$' should be '%1$s'. To fix this issue, we recommend:
1. Go to WPML -> String Translation.
2. Filter by the string domain 'learndash' and mark the option 'include translations'.
3. Search for '%2$ ' (with an empty space at the end of the search).
This will display the incorrect translations that are missing the 's' in the placeholder. These translations need correction to conform to the proper usage of sprintf.
If you're experiencing this issue, please also try updating the LearnDash translations under LearnDash LMS > Settings > Translations. If the problem persists, contact LearnDash support for further assistance with correcting the translations containing placeholders.
Please note that this solution might be irrelevant if it's outdated or not applicable to your case. If the issue persists, we highly recommend checking related known issues, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If necessary, do not hesitate to open a new support ticket with us for further assistance.
