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                循環的含義:就是通過某種語法結構,對某段代碼可以“反復執行”。 while循環語法: ``` while(條件判斷) { 。。。。循環體語句; } ``` 說明: 循環一開始就進行條件判斷: 如果成立:則執行循環體,而后會自動回到循環開始位置繼續進行條件判斷,如此反復; 如果不成立:則退出循環,執行后續語句。 ![](https://img.kancloud.cn/09/2c/092c64714e0d24f1e6e2841a64a4b75d_551x185.png) 流程圖: ![](https://img.kancloud.cn/b6/52/b65263298573753842dc28bec426beaa_383x360.png) 案例: 求7到17的和。 ![](https://img.kancloud.cn/2f/7a/2f7aeaa9573845829b7376b978dbe219_470x222.png) 課堂案例: 求1-100之間能被3整除的數的和! ``` $sum = 0; $n = 1; while( $n <= 100) { if( $n % 3 == 0) { $sum += $n; } $n++; } echo $sum; ```
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