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                **1.**使用global關鍵字來實現(可以參考上面傳值部分有),引用傳地址的關系& 例如: $v1=4; function f4(){global $v1; echo “<br />在局部訪問全局變量v1=$v1”; unset($v1);} f4(); echo “<br />在全局再次訪問v1=$v1”; //在局部訪問全局變量v1=4 在全局再次訪問v1=4 , (上面黃色備注: 在這邊unset,不影響外部$v1使用) **2.**使用$GLOBALS超全局變量來實現,但是我們如果對$GLOBALS變量的某個單元進行unset,則會完全對應銷毀該變量.因為$GLOBALS對全局變量的使用可以看做是全局變量的另一種語法形式而已,而不是“引用關系”,$GLOBALS\[‘--’\]這樣使用
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