[RFC Idea] main() entry point for PHP

This is basically an idea I have for PHP to support a main entry point. Where regardless of execution, if you run a PHP file, in CLI or Web request. If the file that is executed contains a main function, that is automatically executed by the engine after any procedural code. Any procedural code in the file, and included files are executed before main(). I made this decision because there would be cases where developers want to set up a global scope and variables. The main entry function MUST be within the executed file, any included files which contain a main function are treated as user functions. main function signature: function main(): int; main must return an int exit code. Example ```php echo "Before main"; function main(): int { echo "Executed in main"; return 0; } echo "After main"; return 1; // This is ignored as main() exists and its return value is the exit code. ``` Expected output: Before main After main Executed in main PHP returns code 0 *Open questions.* *1.* Should we add a declare(main_entry_point=true); for it to be opt-in *2.* Should main() take arguments? *3.* Should the main() be context aware? eg main(array $argv, int $argc) for the CLI SAPI. I'm not sure what it would be for CGI SAPI.