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                ## 冒泡排序 ``` //冒泡排序 $arr=array(3,20,80,100,200); function mycount($arr){ // 外層 for 循環控制循環次數 for ($i=0; $i<count($arr) ; $i++) { //內層 for 循環進行兩數交換,找每次的最大數,排到最后 for ($j=0; $j < count($arr)-1; $j++) { //數組里第一個和第二個對比,如果1>2,執行數值互換 if($arr[$j] >$arr[$j+1]){ $x = $arr[$j]; //第一賦給一個變量 $arr[$j] = $arr[$j+1]; //第二賦給第一 $arr[$j+1] = $x; //把變量給第二,結果就是1,2的數值互換 // $a=10; // $b=20; // $x=$a; $x=10 // $a=$b; $a=20 // $b=$X; $b=10 } } } return $arr; } ```
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