How can PHP be compiled as DSO to enable HTTP authentication in Apache?

To enable HTTP authentication in Apache with PHP, you can compile PHP as a Dynamic Shared Object (DSO) and then load the module in the Apache configuration file. This allows PHP scripts to access the authentication headers sent by the web server. To compile PHP as a DSO, you can use the following configuration options when running the `configure` script: ```bash ./configure --with-apxs2=/path/to/apxs make make install ``` Then, you can load the PHP module in the Apache configuration file by adding the following line: ```apache LoadModule php7_module /path/to/php7.so ```