本篇文章给大家分享的内容是PHP的四种入门级排序算法,有着一定的参考价值,有需要的朋友可以参考一下
Four entry-level sorting algorithms: Bubble sort, selection sort, insertion sort, quick sort .
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$a = [5,2,4,1,6,5,3,8]; function a($a){ //冒泡排序 //$temp = 0; for($i=0;$i<count($a)-1;$i++){ for($j=0;$j<count($a)-1-$i;$j++){ if($a[$j]>$a[$j+1]){ $temp = $a[$j]; $a[$j] = $a[$j+1]; $a[$j+1] = $temp; } } } print_r($a); } a($a); function order($arr){ //选择排序 //定义中间变量 $temp = 0; $count = count($arr); for($i=0; $i<$count-1; $i++){ //定义最小位置 $minIndex = $i; for($j= $i+1; $j<$count; $j++){ if($arr[$j] < $arr[$minIndex]){ $minIndex = $j; } } if($i != $minIndex){ $temp = $arr[$i]; $arr[$i] = $arr[$minIndex]; $arr[$minIndex] = $temp; } } return $arr; } echo "<pre class="brush:php;toolbar:false">"; print_r(order($a)); function swap(array &$arr,$a,$b){ //直接插入排序 $temp = $arr[$a]; $arr[$a] = $arr[$b]; $arr[$b] = $temp; } function InsertSort(array &$arr){ $count = count($arr); //数组中第一个元素作为一个已经存在的有序表 for($i = 1;$i < $count;$i ++){ $temp = $arr[$i]; //设置哨兵 for($j = $i - 1;$j >= 0 && $arr[$j] > $temp;$j --){ $arr[$j + 1] = $arr[$j]; //记录后移 } $arr[$j + 1] = $temp; //插入到正确的位置 } } InsertSort($a); var_dump('<pre class="brush:php;toolbar:false">',$a); function quick_sort($arr)//函数实现快速排序 { //判断参数是否是一个数组 if(!is_array($arr)) return false; //递归出口:数组长度为1,直接返回数组 $length=count($arr); if($length<=1) return $arr; //数组元素有多个,则定义两个空数组 $left=$right=array(); //使用for循环进行遍历,把第一个元素当做比较的对象 for($i=1;$i<$length;$i++) { //判断当前元素的大小 if($arr[$i]<$arr[0]){ $left[]=$arr[$i]; }else{ $right[]=$arr[$i]; } } //递归调用 $left=quick_sort($left); $right=quick_sort($right); //将所有的结果合并 return array_merge($left,array($arr[0]),$right); } var_dump('<pre class="brush:php;toolbar:false">',$a); //调用 echo "<pre class="brush:php;toolbar:false">"; print_r(quick_sort($a));Related recommendations:
Insertion sort example sharing of PHP sorting algorithm series
Detailed explanation of heap sorting of PHP sorting algorithm
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