over 90 bug fixes, some of which are security related. 5.3.10 2012-02-02 Fixed arbitrary remote code execution vulnerability reported by Stefan Esser, CVE-2012-0830. 5.4.0 2012-03-01 Trait Support, short array syntax support. Removed items: register_globals , safe_mode , allow_call_time_pass_reference , session_register() , session_unregister() and session_is_registered() . Built-in web server. [37] Several improvements