How can one configure PHP under UNIX to ensure it is compiled as 64-bit?

To configure PHP under UNIX to ensure it is compiled as 64-bit, you need to specify the appropriate flags during the compilation process. You can use the "--enable-64bit" flag when running the configure script to enable 64-bit support. This will ensure that PHP is compiled as a 64-bit application. ```bash ./configure --enable-64bit make make install ```