New rules White space after comma in function call Disallows the use of any deprecated functions Makes sure that shorthand PHP open tags are not used. Checks that no perl-style comments (#) are used. No white spaces after opening bracket and before closing bracket in IF Empty statement inline control structure forbidden because it's hard to read the code Open Brace on the same line as the function Ensure that parameters defined for a function that have a default value come at the end of the function signature Ensures that there is no whitespace before a semicolon White space after IF, ELSE, FOREACH, SWITCH keyword