To set PHP headers in a .htaccess file, you need to use the
Header directive. Here's how you can set some common PHP headers:
Make sure that the
mod_headers module is enabled in Apache for these directives to work. You can usually enable it by adding
LoadModule headers_module modules/mod_headers.so to your Apache configuration file or by using the
a2enmod headers command (on Ubuntu/Debian).
Note: These directives will only affect PHP files. You can modify the file extension in
<FilesMatch ".(php)$"> to target different file types, if needed.