What steps can be taken if certain languages are missing from the setlocale() function in PHP?

If certain languages are missing from the setlocale() function in PHP, one possible solution is to install additional locale packages on the server. These packages contain the necessary locale data for the missing languages. Another option is to manually add the missing locale data to the server's locale configuration.

// Example code to set a custom locale if the desired language is missing
setlocale(LC_ALL, 'en_US.UTF-8'); // Set locale to English (United States)