[請益] 在變數名稱後面加一個變數成為一個新變數
在php裡面 已把前端資料post進後端
在處理資料時 因為進來的資料數量不一定但有編碼
範例:$x1=1; $x2=2; $x3=3; $key=3;
用一for迴圈要將資料存進資料庫
for($i=1,$i<=$key,i++){}
這時要把x1 x2 x3放進去的變數名稱語法一直搞不定
(因為不能直接把變數放進去 而是要$x+$i=$x1的語法)
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