PHP关键字（68个）
and or xor __FILE__ extends __LINE__ array() as break case class const continue declare default die() do echo else elseif empty() enddeclare endfor endforeach endif endswitch endwhile eval() exit() extends for foreach function global if include include_once isset() list() new print require require_once return static switch unset() use var while __FUNCTION__ __CLASS__ __METHOD__
final(PHP 5) php_user_filter(PHP 5) interface(PHP 5) implements(PHP 5) exception(PHP 5) public(PHP 5) private(PHP 5) protected(PHP 5) abstract(PHP 5) clone(PHP 5) try(PHP 5) catch(PHP 5) throw(PHP 5) cfunction(PHP 4 only) this(PHP 5 only)