PHP学习之实现排序+查找范例

本篇文章主要讲述的是用PHP实现排序查找的代码示例，具有一定的参考价值，感兴趣的朋友可以了解一下，希望能对你有所启发。

<?php
    /*
*冒泡排序
*/
    function maopao($array){
   for($i =0;$i < count($array);$i++){
  for($j = $i+1;$j < count($array);$j++){
 if($array[$i] > $array[$j]){
$temp = $array[$i];
$array[$i] = $array[$j];
$array[$j] = $temp;
 }
  }
   }
   return $array;
    }
    /*
* 二分查找
*/
    function erfen($array,$search,$low = 0,$hight = 100)
    {
   $midPostion = floor(($low + $hight)/2);
   $midData = $array[$midPostion];
   if($midData == $search)
   {
  return $midPostion;
   }
   if($search < $midData)
   {
  $hight = $midPostion;
  if($hight == 0)
  {
 return false;
  }
  return erfen($array,$search,$low,$hight);
   }else{
  $low = $midPostion + 1;
  if($low > $hight){
 return false;
  }
  return erfen($array,$search,$low,$hight);
   }
    }
    /*
* 100+99+98+.......1;
*/
    function leijia($n)
    {
   if($n == 1){
  return $n;
   }
   return $n + leijia($n-1);
    }
    $a= array(9,4,6,8,2,4,5,1);
    $b= maopao($a);
    $c = array(1,2,3,4,5,6,7,8,9);
    $k = 5;
    $d = erfen($c,$k,0,8);
    $sum = leijia(100);
    echo $sum;