php中的冒泡排序,取舍排序,插入排序
php中的冒泡排序,选择排序,插入排序
??//冒泡排序
??function bubbleSort(&$arr){
????
????$temp=0;
????
????//加入第i个数最大
????for($i=0;$i
??????for($j=0;$j
????????//说明前面的数比后面的数大,就要交换
????????if($arr[$j] > $arr[$j+1]){
??????????$temp=$arr[$j];
??????????$arr[$j]=$arr[$j+1];
??????????$arr[$j+1]=$temp;
????????}
??????}
??????
????
????}
??}
??
??//选择排序
??function selectSort(&$arr){
????
????$temp=0;
????
????for($i=0;$i
??????//假设$i就是最小的数
??????$minValue=$arr[$i];
??????//记录我认为最小数的下标
??????$minIndex=$i;
??????
??????for($j=$i+1;$j
????????//我们认为的最小值,不是最小
????????if($minValue>$arr[$j]){
??????????
??????????$minValue=$arr[$j];
??????????$minIndex=$j;
??????????
????????}
??????}
??????
??????//最后交换
??????$temp=$arr[$i];
??????$arr[$i]=$arr[$minIndex];
??????$arr[$minIndex]=$temp;
????}
??}
??
??//插入排序法
??function insertSort(&$arr){
????
????for($i=1;$i
??????//$insertVal是准备插入的数
??????$insertValue=$arr[$i];
??????//准备先和$insertIndex比较
??????$insertIndex=$i-1;
??????
??????//如果这个条件满足,说明,我们还没有找到适当的位置
??????while($insertIndex>=0 && $insertValue ??????
????????//同时把数后移
????????$arr[$insertIndex+1]=$arr[$insertIndex];
????????
????????$insertIndex--;
??????}
??????
??????//插入(这时给$insertValue找到适合位置)
??????$arr[$insertIndex+1]=$insertValue;
????}
??}
??$arr = Array(0,-1,5);
??
??//冒泡排序法
??//bubbleSort($arr);
??//选择排序法
??//selectSort($arr);
??//插入排序法
??insertSort($arr);
??print_r($arr);
??
??//速度
??//插入排序法 >> 选择排序法 >> 冒泡排序法
??
?>

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