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                **一.隱式負數組鍵增量不會跳過負數** #在PHP8.0之前,如果數組的最后一個鍵為負數,則數組增量操作將跳過所有負數,并選擇下一個鍵為0或下一個正數。在PHP8.0中,將刪除此行為,并且無論最后一個鍵號的符號如何,數組鍵都會增加. &emsp; **二.普通隱式鍵值增1** ``` $arr=['user1']; $arr[]='user2'; $arr[]='user3'; echo "<pre>"; print_r($arr); echo "</pre>"; ``` &emsp; **三.實例** 1.普通升級 ``` $array = [ -42 => 'Foo', ]; $array[] = 'Bar'; ``` 2.array_fill升級 ``` $array = array_fill (-42, 3 , 'Value'); var_dump($array); ``` 3.array_fill升級 ``` $array = [ -42 => 'Foo', ]; array_push($array, "Bar"); var_dump($array); ```
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