PHP4Mono PHP4Mono is a compiler that enables PHP code to run on Mono. It is written in C# and translates PHP scripts to Common Intermediate Language (CIL). Like that PHP scripts can be executed as console applications on Mono. PHP4Mono is a compiler that enables PHP code to run on Mono. It is written in C# and translates PHP scripts to Common Intermediate Language (CIL). Like that PHP scripts can be executed as console applications on Mono. cilcompilermononetphp in `Open Source > PHP 01with codecompilerenablesopenphpphp4monorunsource