Should run migration to import yii tbl_user if not the sign up/login may report error.

worked though all the guide files adjusted structure and
added some missing does

this allows us to implement other activerecord implementations based on
NoSQL dbms

I wasted >1h trying to find out why the debug bar was not shown on my remote staging server. Hopefully this will help other people avoid this mistake...

Added note about "Inconsistent types declared for an argument: U_ARGUMENT_TYPE_MISMATCH" ICU error to i18n docs

Control statements based on the if and elseif constructs must have a single space before the opening parenthesis of the conditional and a single space after the closing parenthesis.