##PHP5.3

+Added "?:" operator

+Added lambda functions and closures

+Added support for namespaces

##PHP5.4

+Added short array syntax support ([1,2,3])

+Added array dereferencing support.

+Added class member access on instantiation ( e.g. （new foo）->bar() ) support

+<?= is now always available regardless of the short_open_tag_setting

+Added binary numbers format (0b001010)

+Added support for Traits

PHP5.3－PHP7 新特性总结