5.4主要包括以下特性:
Added: Traits language constructAdded: Array dereferencing supportAdded: DTrace supportImproved: Improved Zend Engine memory usage and performanceMoved: ext/sqlite moved to pecl (sqlite3 support is still built-in) Removed: break/continue $var syntaxRemoved: register_globals, allow_call_time_pass_reference, and register_long_arrays ini optionsRemoved: session_is_regisitered(), session_registered(), and session_unregister()
相关介绍 http://www.php100.com/html/webkaifa/PHP/PHP/2011/0724/8486.html
