Font-lock in php-mode has a bug wherein certain language constructs inside comments are fontified as if they're not inside comments. This fixes those. In particular:
// case blah
In the first line, "blah" is fontified as a constant; in the second line, as a variable name; and in the third line, as a function name. The change causes them all to be fontified in the comment face, as they should. The change doesn't affect fontification of these constructs outside comments.