Controller Method Name Prefix

cartalot,

Thanks for the additional information. I do understand that a underscore prefix previously denoted a private method to the reader but was NOT enforced by php. However, I believe the use of this convention is old and has faded. As mentioned in my original post, php does not restrict using an underscore prefix in a function, method or class name. Per the php documentation:

A valid function name starts with a letter or underscore, followed by any number of letters, numbers, or underscores.
A valid class name starts with a letter or underscore, followed by any number of letters, numbers, or underscores.

If php does not restrict using an underscore prefix in a function, method or class name, why should CI???