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PHP版本常用的排序算法汇总,
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PHP版本常用的排序算法汇总,

Jun 13, 2016 am 08:48 AM
php Sorting Algorithm

PHP版本常用的排序算法汇总,

//1、冒泡排序

function bubble_sort($arr){
  $n = count($arr);
  for($i=0;$i<$n-1;$i++){
    for($j=$i+1;;$j<$n-$i;$j++){
      if($arr[$j]<$arr[$i]){
        $temp = $arr[$i];
        $arr[$i] = $arr[$j];
        $arr[$j] = $temp;
      }
    }
  }
}
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//2、归并排序

//merge函数将指定的两个有序数组(arr1arr2,)合并并且排序
//我们可以找到第三个数组,然后依次从两个数组的开始取数据哪个数据小就先取哪个的,然后删除掉刚刚取过///的数据
function al_merge($arrA, $arrB)
{
$arrC = array();
while (count($arrA) && count($arrB)) {
//这里不断的判断哪个值小,就将小的值给到arrC,但是到最后肯定要剩下几个值,
//不是剩下arrA里面的就是剩下arrB里面的而且这几个有序的值,肯定比arrC里面所有的值都大所以使用
$arrC[] = $arrA['0'] < $arrB['0'] &#63; array_shift($arrA) : array_shift($arrB);
}
return array_merge($arrC, $arrA, $arrB);
}

//归并排序主程序
function al_merge_sort($arr)
{
$len = count($arr);
if ($len <= 1) {
return $arr; //递归结束条件,到达这步的时候,数组就只剩下一个元素了,也就是分离了数组
}
$mid = intval($len / 2); //取数组中间
$left_arr = array_slice($arr, 0, $mid); //拆分数组0-mid这部分给左边left_arr
$right_arr = array_slice($arr, $mid); //拆分数组mid-末尾这部分给右边right_arr
$left_arr = al_merge_sort($left_arr); //左边拆分完后开始递归合并往上走
$right_arr = al_merge_sort($right_arr); //右边拆分完毕开始递归往上走
$arr = al_merge($left_arr, $right_arr); //合并两个数组,继续递归
return $arr;
}

$arr = array(12, 5, 4, 7, 8, 3, 4, 2, 6, 4, 9);
print_r(al_merge_sort($arr));

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//3、二分查找-递归

//二分查找-递归
function bin_search($array,$low,$high,$k){
  if($low <= $high){
    $mid = intval(($low+$high)/2);
  }else{
    return false;
  }
  if($array[$mid] == $k){
    return $mid;
  }elseif($k < $array[$mid]){
    return bin_search($array,$low,$mid-1,$k);
  }else{
    return bin_search($array,$mid+1,$high,$k);
  }
}
$arr = array(12, 5, 4, 7, 3, 8, 4, 2, 6, 4, 9);
$index = bin_search($arr,0,10,12); //直接输出为空,不解
echo(intval($index));

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//4、二分查找-非递归

function bin_search($arr,$low,$high,$value) {//$arr 数组; $slow 最小索引; $high 最大索引 $value 查找的值
  while($low<=$high) { 
    $mid=intval(($low+$high)/2); 
    if($value==$arr[$mid]){
      return $mid; 
    }elseif($value<$arr[$mid]){
      $high=$mid-1; 
    }else{
      $low=$mid+1; 
    } 
  }
  return false; 
}

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//5、快速排序

function quick_sort($arr) {
  $n=count($arr);
  if($n<=1)
    return $arr;
  $key=$arr[0];
  $left_arr=array();
  $right_arr=array();
  for($i=1;$i<$n;$i++) {
    if($arr[$i]<=$key)
      $left_arr[]=$arr[$i];
    else
      $right_arr[]=$arr[$i];
  }
  $left_arr=quick_sort($left_arr);
  $right_arr=quick_sort($right_arr);
  return array_merge($left_arr,array($key),$right_arr);
}

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//6、选择排序

function select_sort($arr) {
  $n=count($arr);
  for($i=0;$i<$n;$i++) {
    $k=$i;
    for($j=$i+1;$j<$n;$j++) {
      if($arr[$j]<$arr[$k])
        $k=$j;
    }
    if($k!=$i) {
      $temp=$arr[$i];
      $arr[$i]=$arr[$k];
      $arr[$k]=$temp;
    }
  }
  return $arr;
}

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//7、插入排序

function insertSort($arr) {
  $n=count($arr);
  for($i=1;$i<$n;$i++) {
    $tmp=$arr[$i];
    $j=$i-1;
    while($arr[$j]>$tmp) {
      $arr[$j+1]=$arr[$j];
      $arr[$j]=$tmp;
      $j--;
      if($j<0)
        break;
    }
  }
  return $arr;
}

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