Ticket #3230: PHP.syntax improvement

Current php.syntax (Utopic 3:4.8.12-1) gets confused with embedded HTML or DOCTYPE statements with strings.
Here's a suggested patch to fix it.

Signed-off-by: Slava Zanko <slavazanko@gmail.com>
Merge branch '3230_php_syntax'

* 3230_php_syntax:
  Ticket #3230: PHP.syntax improvement