The global argument --require is useful in a wide range of situations however I would like a easy way to run simple PHP code without having to create a file. Considering WP-CLI has native commands wp eval <php-code> and wp eval-file <file>, I propose a new separate global argument for running arbitrary PHP code.

Now I'd rather not break existing workflows so maybe --require=<file> could remain as-is and a new global argument be introduced for running code. How about something like --require-code=<php-code>.

With this we could simply do something like wp plugin update --all --require-code="define( 'WP_ADMIN', true );" and would be a fair solution for this common issue wp-cli/extension-command#106. Would also be useful for a wide range of situations.

Ideas or thoughts?

An alternative cleaner idea would be to make --require smart. It could hunt for a PHP file to require, if not found, it could maybe try and see if it's PHP and run that? I'm not sure.