1.可變參數列表 要求v5.6+ ~~~ <?php function?sum(...$numbers)?{ ????$acc?=?0; ????foreach?($numbers?as?$n)?{ ????????$acc?+=?$n; ????} ????return?$acc; } echo?sum(1,?2,?3,?4);//10 ?> ~~~ v5.5及以前 ~~~ <?php function?sum()?{ ????$acc?=?0; ????foreach?(func_get_args()?as?$n)?{ ????????$acc?+=?$n; ????} ????return?$acc; } echo?sum(1,?2,?3,?4);//10 ?> ~~~ 2.Trait\[特性的屬性和方法可被調用的類吸收\] 要求v5.4+ ~~~ <?php //同名沖突解決方案,默認優先級為?trait覆蓋父類,子類覆蓋trait.子類中多個trait有同名沖突需要顯式使用insteadof 操作符來指明使用沖突中的哪一個?可以銜接as?給trait的func取別名,也可以單獨使用as更改trait的func的訪問權限 class?people?{ ????public?function?__construct(){ ????????echo?'我是人類<br/>'; ????if(method_exists($this,?'init')){ ????????$this->init(); ????} ????} } Trait?child?{ ????public?function?cry(){ ????????echo?'我會child哭'; ????} ???? ????private?function?init(){ ????????echo?'我是小孩<br/>'; ????} } Trait?boy?{ ????public?function?cry(){ ????????echo?'我會boy哭'; ????} ???? ????protected?function?init(){ ????????echo?'我是小孩<br/>'; ????} } class?student?extends?people?{ ????use?child,boy{ ????????child::init?insteadOf?boy; ????????boy::cry?insteadOf?child; ????????init?as?public; ????} ????//?public?function?init(){ ????//?????echo?'我是學生<br/>'; ????//?} } $student?=?new?student; $student->cry(); exit; ~~~