PHP兑现各种排序

<?php/** * 各种排序 * @author zhaojaingwei * @since 2011/11/21 16:14 * */$list = array(3,5,1,2,10,8,15,19,20);//快排function fast(&$list, $low, $high){    if($high - $low > 5){        while($low < $high){            $key = excute($list, $low, $high);            fast($list, $low, $key - 1);            //fast($list, $key + 1, $high);//普通递归实现            $low = $key + 1;//尾递归实现        }    }else{        insert($list);    }}//快排执行一次排序function excute(&$list, $low, $high){    swap($list, $low, ($low + $high)/2);    $temp = $list[$low];    while($low < $high){        while($low < $high && $list[$high] > $temp){            $high --;        }        $list[$low] = $list[$high];        while($low < $high && $list[$low] < $temp){            $low ++;        }                $list[$high] = $list[$low];    }    $list[$low] = $temp;    return $low;}//堆排序function heap(&$list){    buildHeap($list);    for($i = count($list) - 1; $i > 0; $i --){        swap($list, $i, 0);        heapfy($list, 0, $i - 1);     }}//创建堆function buildHeap(&$list){    for($i = (count($list) - 2)/2; $i >= 0; $i --){         heapfy($list, $i, count($list) - 1);      }}//维护堆function heapfy(&$list, $low, $high){    $temp = $list[$low];    for($i = ($low * 2 + 1); $i <= $high; $i = ($i * 2 + 1)){        if($i < $high && $list[$i] < $list[$i + 1]){            $i ++;           }        if($temp < $list[$i]){            swap($list, $i, $low);            $low = $i;        }else{            break;        }    }    $list[$low] = $temp;}//希尔排序function shell(&$list){    $a = 0;    $code = count($list)/3 + 1;    while($code >= 1){        for($i = $code; $i < count($list); $i ++){            $a ++;            if($list[$i] < $list[$i - $code]){                $temp = $list[$i];                $list[$i] = $list[$i - $code];                $j = $i - 2*$code;                                for(; $j >= 0 && $list[$j] > $temp; $j -= $code){                    $list[$j + $code] = $list[$j];                    $a ++;                 }                $list[$j + $code] = $temp;            }        }        $code = $code/3;    }    echo $a;}//直接插入排序function insert(&$list){    $a = 0;    for($i = 1; $i < count($list); $i ++){        $a ++;        if($list[$i] < $list[$i - 1]){            $temp = $list[$i];            $list[$i] = $list[$i - 1];                        $j = $i - 2;             for(; $list[$j] > $temp; $j --){                $a ++;                $list[$j + 1] = $list[$j];             }                        $list[$j + 1] = $temp;        }    }    echo $a;}//简单选择排序function select(&$list){    $a = 0;    for($i = 0; $i < count($list); $i ++){        $min = $i;        $a ++;        for($j = $i + 1; $j < count($list); $j ++){            $a ++;            if($list[$j] < $list[$min]){                $min = $j;            }        }            if($min != $i)            swap($list, $i, $min);    }    echo $a;}//冒泡排序function bubble(&$list){    $swap = TRUE;    $a = 0;    for($i = 0; $i < count($list) && $swap; $i ++){        $swap = FALSE;        $a ++;        for($j = count($list) - 2; $j >= $i; $j --){            $a ++;            if($list[$j] > $list[$j + 1]){                $swap = TRUE;                swap($list, $j, $j + 1);            }        }    }    echo $a;}//移动或交换函数function swap(&$list, $i, $j){    $temp = $list[$i];    $list[$i] = $list[$j];    $list[$j] = $temp;}?>