php排序算法?php排序经典算法
本文章来给大家总结几个不错的php排序算法,希望这些算法对各位同学会有所帮助哦。
代码如下 | 复制代码 |
$array = array(a,f,c,b,e,h,j,i,g); function maopao_fun($array){ if($len return $arr; } $count = count($array); for($i=0;$i for($j=$count-1;$j>$i;$j--){ if($array[$j] > $array[$j-1]){ $tmp = $array[$j]; $array[$j] = $array[$j-1]; $array[$j-1] = $tmp; } } } return $array; } 2.快速排序, function quickSort($arr){ $len = count($arr); if($len return $arr; } $key = $arr[0]; $left_arr = array(); $right_arr = array(); for($i=1; $i if($arr[$i] $left_arr[] = $arr[$i]; } else { $right_arr[] = $arr[$i]; } } $left_arr = quickSort($left_arr); $right_arr = quickSort($right_arr); return array_merge($left_arr, array($key), $right_arr); } |
3.选择排序
每一趟从待排序的数据元素中选出最小(或最大)的一个元素,
顺序放在已排好序的数列的最后,直到全部待排序的数据元素排完。 选择排序是不稳定的排序方法
代码如下 | 复制代码 |
function select_sort($arr){ $count = count($arr); for($i=0; $i for($j=$i+1; $j if ($arr[$i] > $arr[$j]){ $tmp = $arr[$i]; $arr[$i] = $arr[$j]; $arr[$j] = $tmp; } } } return $arr; } |
4.插入排序
从第一个元素开始,该元素可以认为已经被排序
取出下一个元素,在已经排序的元素序列中从后向前扫描
如果该元素(已排序)大于新元素,将该元素移到下一位置
重复步骤3,直到找到已排序的元素小于或者等于新元素的位置
将新元素插入到下一位置中
重复步骤2
代码如下 | 复制代码 |
function insert_sort($arr){ $count = count($arr); for($i=1; $i $tmp = $arr[$i]; $j = $i - 1; while($arr[$j] > $tmp){ $arr[$j+1] = $arr[$j]; $arr[$j] = $tmp; $j--; } } return $arr; }
$arr = array(49,38,65,97,76,13,27); print_r(insert_sort($arr));
|
四种排序算法的PHP实现
1) 插入排序(Insertion Sort)的基本思想是:
每次将一个待排序的记录,按其关键字大小插入到前面已经排好序的子文件中的适当位置,直到全部记录插入完成为止。
2) 选择排序(Selection Sort)的基本思想是:
每一趟从待排序的记录中选出关键字最小的记录,顺序放在已排好序的子文件的最后,直到全部记录排序完毕。
3) 冒泡排序的基本思想是:
两两比较待排序记录的关键字,发现两个记录的次序相反时即进行交换,直到没有反序的记录为止。
4) 快速排序实质上和冒泡排序一样,都是属于交换排序的一种应用。所以基本思想和上面的冒泡排序是一样的。
代码如下 | 复制代码 |
/** return array_merge($left_arr, array($key), $right_arr); /*End of file sort.php*/ |

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